/Makefile/1.11/Wed Sep 18 06:16:39 2002//
/ttext1.c/1.8/Tue Apr 25 03:03:06 2006//
/data.c/1.8/Thu Aug 13 03:02:47 2009//
/tutor.h/1.11/Sun Oct 14 03:01:56 2012//
/ttext2.c/1.10/Sun Oct 20 03:01:51 2013//
/teach.c/1.25/Mon Feb  4 03:01:15 2019//
/tutor.c/1.12/Mon May  3 03:01:36 2021//
D