CC-BY-SA-3.0
Taken from cmss13 at: https://github.com/cmss13-devs/cmss13/blob/9dd2c0d0a1c21e3c9bddbad1321c63fd886f61cf/icons/turf/floors/carpet_manual.dmi; isolated four-corner source composition and quarter crops for CMU 3D review. See SOURCES_PRISON_CARPET.md.
