/sources/plan9/sys/src/libgeometry/
      4298 1999-12-12 arith3.c
      3735 1999-12-12 matrix.c
       318 2002-10-24 mkfile
      1355 2013-02-01 qball.c
      5707 1999-12-12 quaternion.c
      1995 1999-12-12 transform.c
      4716 1999-12-12 tstack.c