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Removing edges without destroying the surrounding geometry is called "dissolving” edges in Blender. It's an essential skill to learn in 3D modeling. Here... | By Blender Secrets | Facebook
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Deleting & Dissolving — Blender Manual
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Deleting & Dissolving — Blender Manual
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modeling - How to delete polygons/edges/vertices at once, without selecting the corresponding item in the menu on the X key? - Blender Stack Exchange
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