code/modules/unit_tests/~nova/custom_sprites/region_selection.dm 
| /proc/custom_sprite_test_region_seam | A front-view pixel of upper right above a pixel of lower, as list(x, y) of the upper one, or null. |
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| /proc/custom_sprite_test_region_seam | A front-view pixel of upper right above a pixel of lower, as list(x, y) of the upper one, or null. |
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