.xx "azel" "obtain satellite predictions" .xx "bj" "the game of black jack" .xx "cal" "print calendar" .xx "chess" "the game of chess" .xx "cubic" "three dimensional tic-tac-toe" .xx "hyphen" "find hyphenated words" .xx "m6" "general purpose macro processor" .xx "maze" "generate a maze problem" .xx "moo" "guessing game" .xx "ov" "overlay pages" .xx "ptx" "permuted index" .xx "sky" "obtain ephemerides" .xx "spline" "interpolate smooth curve" .xx "tmg" "compiler-compiler" .xx "ttt" "tic-tac-toe" .xx "yacc" "yet another compiler-compiler"