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A Beginner's Guide to Geometry Dash

by marleneostetler＠wshu.net

Ever found yourself captivated by the rhythmic thumping and vibrant visuals of a game where a block navigates a perilous obstacle course? That's the essence of Geometry Dash, a deceptively simple yet endlessly engaging rhythm-based platformer that has garnered a massive following. If you're looking to dive into a game that tests your reflexes, spatial awareness, and musicality, you've come to the right place. This guide will walk you through the basics of experiencing this unique title, offering tips and insights for both newcomers and those looking to improve. What is Geometry Dash? A Symphony of Squares and Spikes At its core, geometry dash is about guiding a square-shaped icon through a series of levels, each meticulously synchronized to an energetic electronic soundtrack. The objective is straightforward: reach the end of the level without crashing into any obstacles. These obstacles range from stationary spikes and moving saws to gravity-altering portals and speed-changing gates. The beauty of Geometry Dash lies in its elegant simplicity – a single tap or click makes your icon jump. Hold down, and it will continuously jump (or fly, depending on the current game mode). https://geometrydashlitefree.com The game isn't just about pixel-perfect timing; it's also about memorization and pattern recognition. Each level is a carefully choreographed dance between your icon and the environment. While the initial levels serve as a tutorial of sorts, introducing new mechanics and obstacles gradually, the difficulty quickly ramps up, demanding precise execution and a keen ear for the music's rhythm. The satisfaction of finally conquering a particularly challenging section, after countless attempts, is a feeling few other games can replicate. Getting Started: Your First Jumps and Flips Jumping into geometry dash is surprisingly easy. Most versions of the game offer a "Lite" or free demo, allowing you to experience a taste of the action without commitment. Once you've launched the game, you'll likely be presented with a selection of official levels, each with its own unique theme, music, and difficulty rating. Start with the earliest levels, such as "Stereo Madness" or "Back on Track." These are designed to introduce you to the fundamental mechanics: the basic jump, the continuous jump, and how the music dictates the flow of the level. Don't be discouraged by early failures; dying is an integral part of the learning process in Geometry Dash. Each failed attempt offers a valuable lesson, revealing the timing of a jump or the placement of an obstacle you hadn't noticed before. As you progress, you'll encounter various game modes, each changing how your icon behaves: Cube: The standard jumping icon. Ship: Your icon transforms into a spaceship, allowing you to fly by holding down. Releasing the button causes you to descend. Ball: Gravity flips with each tap, making your icon roll along the ceiling or floor. UFO: Similar to the ship, but each tap causes a short burst of upward flight. Wave: Your icon moves in a diagonal wave pattern, controlled by holding down to go up and releasing to go down. Robot: A bouncier version of the cube, with adjustable jump height based on how long you hold down. Spider: Instantly teleports your icon between the floor and ceiling with each tap. Mastering these modes, and understanding how they interact with different portals and environmental elements, is key to success. Tips for Taming the Dash Geometry Dash can be frustrating, but with the right approach, it becomes incredibly rewarding. Here are some tips to help you on your journey: Start Slow and Steady: Don't immediately jump into demon levels. Work your way through the official levels in order, gradually building your skills and understanding of the game's mechanics. Practice Mode is Your Best Friend: Every level features a "Practice Mode" where you can place checkpoints. This allows you to tackle difficult sections repeatedly without having to restart the entire level. Utilize it extensively to learn tricky timings and obstacle patterns. Listen to the Music: The music isn't just background noise; it's a vital part of the gameplay. Many jumps and actions are synchronized with the beat, so paying attention to the rhythm can significantly improve your timing. Focus on One Section at a Time: If you're struggling with a particular part of a level, break it down. Practice that specific sequence in practice mode until you can consistently clear it. Don't Be Afraid to Take Breaks: Frustration can quickly set in. If you find yourself getting angry or making more mistakes, step away from the game for a bit. A fresh perspective can often work wonders. Experiment with Custom Levels: Once you've tackled the official levels, the community-created levels offer an endless supply of challenges and creativity. From auto levels to extreme demons, there's something for everyone. The Endless Dash Geometry Dash is more than just a game; it's a testament to dedication and perseverance. Its simple controls belie a deep and challenging experience that rewards patience and practice. Whether you're aiming to conquer every official level, create your own elaborate courses, or simply enjoy the captivating music and visuals, the world of Geometry Dash offers endless possibilities. So, grab your virtual square, crank up the volume, and prepare for an exhilarating ride through a vibrant, spike-filled world.

3 weeks, 6 days

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by humanhealthchems＠gmail.com

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4 weeks

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4 weeks

[PATCH v15 0/6] Rust bindings for gem shmem

by Lyude Paul

Most of this patch series has already been pushed upstream, this is just the second half of the patch series that has not been pushed yet + some additional changes which were required to implement changes requested by the mailing list. This patch series is originally from Asahi, previously posted by Daniel Almeida. The previous version of the patch series can be found here: https://patchwork.freedesktop.org/series/164580/ Branch with patches applied available here: https://gitlab.freedesktop.org/lyudess/linux/-/commits/rust/gem-shmem This patch series applies on top of drm-rust-next with the following dependencies applied: https://lore.kernel.org/rust-for-linux/20260529173137.303717-1-lyude@redhat… Lyude Paul (6): rust: gem: shmem: Fix Default implementation for ObjectConfig rust: drm: gem/shmem: Add DmaResvGuard helper rust: drm: gem: Add vmap functions to shmem bindings rust: faux: Allow retrieving a bound Device drm/gem/shmem: Introduce __drm_gem_shmem_free_sgt_locked() rust: drm: gem: Introduce shmem::Object::sg_table() drivers/gpu/drm/drm_gem_shmem_helper.c | 32 +- include/drm/drm_gem_shmem_helper.h | 1 + rust/kernel/drm/gem/shmem.rs | 497 ++++++++++++++++++++++++- rust/kernel/faux.rs | 7 +- 4 files changed, 512 insertions(+), 25 deletions(-) base-commit: 0e42ec83d46ab8877d38d37493328ed7d1a24de8 prerequisite-patch-id: c8ade07eec6e9c9e875800b114137c459d362e4e prerequisite-patch-id: c38da06dbc4cfd2589bf2e7e9f0ebaa4da521ddf -- 2.54.0

4 weeks

[PATCH] drm/prime: Fix unsupervised rb_tree corruption in drm_prime_remove_buf_handle

by w15303746062＠163.com

From: Mingyu Wang <25181214217(a)stu.xidian.edu.cn> Syzkaller fuzzer triggered a kernel panic via a WARNING in drm_prime_destroy_file_private() due to a non-empty prime rb_tree. The root cause is a complete lack of synchronization in the teardown path. While the import path (drm_gem_prime_fd_to_handle) holds the &file_priv->prime.lock during lookup and insertion, the deletion path (drm_prime_remove_buf_handle) traverses and mutates both the 'handles' and 'dmabufs' rb_trees without acquiring any mutex. When multiple threads concurrently close GEM handles or interleave import and close operations, the pointers and balance states of the rb_tree nodes get corrupted. As a result, certain members are erased from one tree but remain orphaned in the other. Upon process exit, the final sanity check triggers the WARNING. [ 448.919314][T19739] ------------[ cut here ]------------ [ 448.945387][T19739] WARNING: CPU: 0 PID: 19739 at drivers/gpu/drm/drm_prime.c:223 drm_prime_destroy_file_private+0x43/0x60 ... [ 449.056535][T19739] Call Trace: [ 449.056544][T19739] <TASK> [ 449.056553][T19739] drm_file_free.part.0+0x805/0xcf0 [ 449.056652][T19739] drm_close_helper.isra.0+0x183/0x1f0 [ 449.056677][T19739] drm_release+0x1ab/0x360 [ 449.056719][T19739] __fput+0x402/0xb50 [ 449.056783][T19739] task_work_run+0x16b/0x260 [ 449.056883][T19739] exit_to_user_mode_loop+0xf9/0x130 [ 449.056931][T19739] do_syscall_64+0x424/0xfa0 [ 449.056977][T19739] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 449.057268][T19739] </TASK> [ 449.057295][T19739] Kernel panic - not syncing: kernel: panic_on_warn set ... Fix this by acquiring the prime_fpriv->lock mutex around the rb_tree lookup and erasure logic. To respect the locking rules and avoid potential deadlocks with driver-specific memory cleanups, assign the target node to a temporary pointer and defer the dma_buf_put() and kfree() operations until after the mutex is safely dropped. Fixes: ea2aa97ca37a ("drm/gem: Fix GEM handle release errors") Cc: stable(a)vger.kernel.org Signed-off-by: Mingyu Wang <25181214217(a)stu.xidian.edu.cn> --- drivers/gpu/drm/drm_prime.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 9b44c78cd77f..26319c638e0f 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -190,6 +190,9 @@ void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, uint32_t handle) { struct rb_node *rb; + struct drm_prime_member *found = NULL; + + mutex_lock(&prime_fpriv->lock); rb = prime_fpriv->handles.rb_node; while (rb) { @@ -200,8 +203,7 @@ void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, rb_erase(&member->handle_rb, &prime_fpriv->handles); rb_erase(&member->dmabuf_rb, &prime_fpriv->dmabufs); - dma_buf_put(member->dma_buf); - kfree(member); + found = member; break; } else if (member->handle < handle) { rb = rb->rb_right; @@ -209,6 +211,13 @@ void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, rb = rb->rb_left; } } + mutex_unlock(&prime_fpriv->lock); + + /* Defer resource release outside the mutex to prevent deadlocks */ + if (found) { + dma_buf_put(found->dma_buf); + kfree(found); + } } void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) -- 2.34.1

4 weeks

[PATCH] drm/amdgpu: fix recursive ww_mutex acquire in amdgpu_devcoredump_format

by Mikhail Gavrilov

When dumping IB contents from a hung job, amdgpu_devcoredump_format() acquires the VM root PD's reservation lock via amdgpu_vm_lock_by_pasid() and then, for each IB referenced by the job, calls amdgpu_bo_reserve() on the BO that backs the IB. Both reservations are taken on reservation_ww_class_mutex objects but neither uses a ww_acquire_ctx, which trips lockdep: WARNING: possible recursive locking detected -------------------------------------------- kworker/u128:0 is trying to acquire lock: ffff88838b16e1f0 (reservation_ww_class_mutex){+.+.}-{4:4}, at: amdgpu_devcoredump_format+0x1594/0x23f0 [amdgpu] but task is already holding lock: ffff8882f82681f0 (reservation_ww_class_mutex){+.+.}-{4:4}, at: amdgpu_devcoredump_format+0x1594/0x23f0 [amdgpu] Possible unsafe locking scenario: CPU0 ---- lock(reservation_ww_class_mutex); lock(reservation_ww_class_mutex); *** DEADLOCK *** May be due to missing lock nesting notation Workqueue: events_unbound amdgpu_devcoredump_deferred_work [amdgpu] Call Trace: __ww_mutex_lock.constprop.0 ww_mutex_lock amdgpu_bo_reserve amdgpu_devcoredump_format+0x1594 [amdgpu] amdgpu_devcoredump_deferred_work+0xea [amdgpu] process_one_work worker_thread kthread The two reservations are on different BOs in the captured trace, so the splat is a lockdep-correctness warning, not an observed deadlock. It becomes a real self-deadlock whenever the IB BO shares its dma_resv with the root PD (the always-valid case, see amdgpu_vm_is_bo_always_valid()): amdgpu_bo_reserve(abo) re-acquires the same ww_mutex without a ticket and blocks forever. With amdgpu.gpu_recovery=0 the timeout handler refires every ~2 s and each invocation produces this splat, drowning the kernel ring buffer. Fix it by collecting the per-IB BO references under the root PD's reservation, then releasing the root before reserving each IB BO individually. The walk over the VM mapping tree must remain under the root lock (mappings can be torn down without it), but the actual content copies do not need to nest inside it. Each per-IB reservation is now an independent top-level acquire, eliminating the nested ww_mutex. The collect/release logic is factored out into two small helpers (amdgpu_devcoredump_collect_ib_refs / amdgpu_devcoredump_release_ib_refs) to keep the main function's indentation reasonable. This also fixes a BO refcount leak in the original code: when amdgpu_bo_reserve() failed, control jumped to free_ib_content without running amdgpu_bo_unref(). In the new structure the per-IB BO refs are released unconditionally in the cleanup helper. Reproducer (~150 LoC libdrm_amdgpu): submit a single GFX IB containing PACKET3_INDIRECT_BUFFER chained at GPU VA 0 and wait for the fence. The TDR fires within ~10 s and the deferred coredump worker produces the splat above on every invocation. Fixes: 7b15fc2d1f1a ("drm/amdgpu: dump job ibs in the devcoredump") Cc: stable(a)vger.kernel.org # 7.1 Signed-off-by: Mikhail Gavrilov <mikhail.v.gavrilov(a)gmail.com> --- .../gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c | 147 +++++++++++++----- 1 file changed, 110 insertions(+), 37 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c index d386bc775d03..f6bb968de756 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c @@ -207,6 +207,72 @@ static void amdgpu_devcoredump_fw_info(struct amdgpu_device *adev, } } +struct amdgpu_devcoredump_ib_ref { + struct amdgpu_bo *bo; + u64 offset; +}; + +/* + * Walk the VM's mapping tree under the root PD's reservation to obtain the BO + * that backs each IB and pin it with a refcount. The root PD reservation is + * dropped before this function returns; the caller can then reserve each IB + * BO individually without nesting ww_mutex acquires on + * reservation_ww_class_mutex. + * + * Returns an array of num_ibs entries (each ib_refs[i].bo may be NULL if its + * mapping was not found), or NULL on allocation failure / VM lookup failure. + * The caller must release the BO refs and free the array. + */ +static struct amdgpu_devcoredump_ib_ref * +amdgpu_devcoredump_collect_ib_refs(struct amdgpu_device *adev, + struct amdgpu_coredump_info *coredump) +{ + struct amdgpu_devcoredump_ib_ref *ib_refs; + struct amdgpu_bo_va_mapping *mapping; + struct amdgpu_bo *root; + struct amdgpu_vm *vm; + u64 va_start; + + ib_refs = kcalloc(coredump->num_ibs, sizeof(*ib_refs), GFP_KERNEL); + if (!ib_refs) + return NULL; + + vm = amdgpu_vm_lock_by_pasid(adev, &root, coredump->pasid); + if (!vm) { + kfree(ib_refs); + return NULL; + } + + for (int i = 0; i < coredump->num_ibs; i++) { + va_start = coredump->ibs[i].gpu_addr & AMDGPU_GMC_HOLE_MASK; + mapping = amdgpu_vm_bo_lookup_mapping(vm, va_start / AMDGPU_GPU_PAGE_SIZE); + if (!mapping) + continue; + + ib_refs[i].bo = amdgpu_bo_ref(mapping->bo_va->base.bo); + ib_refs[i].offset = va_start - + mapping->start * AMDGPU_GPU_PAGE_SIZE; + } + + amdgpu_bo_unreserve(root); + amdgpu_bo_unref(&root); + + return ib_refs; +} + +static void +amdgpu_devcoredump_release_ib_refs(struct amdgpu_devcoredump_ib_ref *ib_refs, + int num_ibs) +{ + if (!ib_refs) + return; + + for (int i = 0; i < num_ibs; i++) + if (ib_refs[i].bo) + amdgpu_bo_unref(&ib_refs[i].bo); + kfree(ib_refs); +} + static ssize_t amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_info *coredump) { @@ -214,13 +280,11 @@ amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_inf struct drm_printer p; struct drm_print_iterator iter; struct amdgpu_vm_fault_info *fault_info; - struct amdgpu_bo_va_mapping *mapping; struct amdgpu_ip_block *ip_block; struct amdgpu_res_cursor cursor; - struct amdgpu_bo *abo, *root; - uint64_t va_start, offset; + struct amdgpu_bo *abo; + uint64_t offset; struct amdgpu_ring *ring; - struct amdgpu_vm *vm; u32 *ib_content; uint8_t *kptr; int ver, i, j, r; @@ -343,43 +407,52 @@ amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_inf drm_printf(&p, "VRAM is lost due to GPU reset!\n"); if (coredump->num_ibs) { - /* Don't try to lookup the VM or map the BOs when calculating the - * size required to store the devcoredump. + struct amdgpu_devcoredump_ib_ref *ib_refs = NULL; + + /* + * Snapshot per-IB BO references under the root PD's reservation, + * then release the root before reserving each IB BO individually + * to copy its contents. + * + * Reserving an IB BO while the root PD is still reserved would + * be a nested ww_mutex acquire on reservation_ww_class_mutex + * without a ww_acquire_ctx, which trips lockdep's recursive- + * locking check and self-deadlocks for IB BOs that share their + * dma_resv with the root PD (always-valid BOs). + * + * Skip lookup/reservation entirely on the sizing pass: it does + * not write IB content, and the size estimate doesn't depend on + * whether the BOs are reachable. */ - if (sizing_pass) - vm = NULL; - else - vm = amdgpu_vm_lock_by_pasid(adev, &root, coredump->pasid); + if (!sizing_pass) + ib_refs = amdgpu_devcoredump_collect_ib_refs(adev, coredump); - for (int i = 0; i < coredump->num_ibs && (sizing_pass || vm); i++) { + for (int i = 0; i < coredump->num_ibs; i++) { ib_content = kvmalloc_array(coredump->ibs[i].ib_size_dw, 4, GFP_KERNEL); if (!ib_content) continue; - /* vm=NULL can only happen when 'sizing_pass' is true. Skip to the - * drm_printf() calls (ib_content doesn't need to be initialized - * as its content won't be written anywhere). - */ - if (!vm) + if (sizing_pass) goto output_ib_content; - va_start = coredump->ibs[i].gpu_addr & AMDGPU_GMC_HOLE_MASK; - mapping = amdgpu_vm_bo_lookup_mapping(vm, va_start / AMDGPU_GPU_PAGE_SIZE); - if (!mapping) - goto free_ib_content; + if (!ib_refs || !ib_refs[i].bo) + goto output_ib_content; + + abo = ib_refs[i].bo; + offset = ib_refs[i].offset; - offset = va_start - (mapping->start * AMDGPU_GPU_PAGE_SIZE); - abo = amdgpu_bo_ref(mapping->bo_va->base.bo); r = amdgpu_bo_reserve(abo, false); if (r) - goto free_ib_content; + goto output_ib_content; if (abo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS) { off = 0; - if (abo->tbo.resource->mem_type != TTM_PL_VRAM) - goto unreserve_abo; + if (abo->tbo.resource->mem_type != TTM_PL_VRAM) { + amdgpu_bo_unreserve(abo); + goto output_ib_content; + } amdgpu_res_first(abo->tbo.resource, offset, coredump->ibs[i].ib_size_dw * 4, @@ -395,8 +468,10 @@ amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_inf r = ttm_bo_kmap(&abo->tbo, 0, PFN_UP(abo->tbo.base.size), &abo->kmap); - if (r) - goto unreserve_abo; + if (r) { + amdgpu_bo_unreserve(abo); + goto output_ib_content; + } kptr = amdgpu_bo_kptr(abo); kptr += offset; @@ -406,21 +481,19 @@ amdgpu_devcoredump_format(char *buffer, size_t count, struct amdgpu_coredump_inf amdgpu_bo_kunmap(abo); } + amdgpu_bo_unreserve(abo); + output_ib_content: drm_printf(&p, "\nIB #%d 0x%llx %d dw\n", i, coredump->ibs[i].gpu_addr, coredump->ibs[i].ib_size_dw); - for (int j = 0; j < coredump->ibs[i].ib_size_dw; j++) - drm_printf(&p, "0x%08x\n", ib_content[j]); -unreserve_abo: - if (vm) - amdgpu_bo_unreserve(abo); -free_ib_content: + if (!sizing_pass && ib_refs && ib_refs[i].bo) { + for (int j = 0; j < coredump->ibs[i].ib_size_dw; j++) + drm_printf(&p, "0x%08x\n", ib_content[j]); + } kvfree(ib_content); } - if (vm) { - amdgpu_bo_unreserve(root); - amdgpu_bo_unref(&root); - } + + amdgpu_devcoredump_release_ib_refs(ib_refs, coredump->num_ibs); } return count - iter.remain; -- 2.54.0

4 weeks

A Guide to Slither io and the Joy of Simple Gaming

by kaywilson＠wshu.net

In a world filled with hyper-realistic graphics and complex narratives, sometimes the most captivating experiences are the simplest. Enter Slither io, a game that takes the classic "snake" concept and injects it with a healthy dose of online multiplayer mayhem. If you've ever found yourself drawn to the addictive nature of growing a digital creature, or the thrill of outsmarting your opponents in a low-stakes, high-fun environment, then read on. This article will guide you through the basics of Slither io and offer some insights into how to master its charmingly straightforward gameplay. What is Slither io? A Journey into the World of Glowing Serpents Slither io is an online multiplayer arcade game where you control a vibrant, glowing snake. Your objective is deceptively simple: grow your snake by consuming glowing pellets scattered across the map, while avoiding collisions with other players. The twist? Unlike traditional snake games, touching another snake's body (not just its head) means instant demise. This core mechanic creates a dynamic and surprisingly strategic environment where even the smallest snake can take down the largest, given the right timing and tactical positioning. The game's accessibility, with its browser-based play and intuitive controls, makes it a perfect pick-up-and-play experience for anyone looking to unwind and have a little competitive fun. The Dance of the Serpent: Understanding Slither io Gameplay Getting started in Slither io is remarkably easy. Upon loading the game, you'll be prompted to enter a nickname. Once you're in, you'll find yourself as a small, brightly colored snake on a vast, dark arena filled with glowing food. https://slitherio.onl Movement: Your snake follows your mouse cursor. Simply move your mouse to guide your snake in the desired direction. There are no "up, down, left, right" keys – it's all about smooth, continuous movement. 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By gradually enclosing them, you force them into a smaller and smaller space until they inevitably collide with your body. Embrace the Edge: The edges of the map can be surprisingly safe, as fewer players tend to congregate there. It’s a good place to grow in relative peace during the early stages of your game. Capitalize on Chaos: When a large snake dies, it creates a feeding frenzy. While it's tempting to dive in immediately, observe the situation. Often, other players will collide in their eagerness, leaving even more food for a patient observer. Don't Be Afraid to Die: Seriously! Each death is a learning opportunity. Pay attention to how you were eliminated and try to avoid making the same mistake twice. The beauty of Slither io is that you can restart instantly and jump back into the action. The Endless Dance: Why Slither io Remains Relevant Slither io, available to play at Slither io, is more than just a casual game; it's a testament to the power of simple yet engaging mechanics. Its low barrier to entry, combined with surprisingly deep strategic possibilities, makes it a timeless classic. Whether you're looking for a quick break, a competitive outlet, or just a chance to unwind, embracing your inner serpent in the vibrant world of Slither io is an experience well worth trying. Go forth, consume, and dominate the leaderboard!

4 weeks

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