TETRAVEX
........\tetravex.tpi
........\TETRAVEX1.IN
........\TETRAVEX1.OUT
........\TETRAVEX2.IN
........\tetravex2.out
........\tetravex3.in
........\tetravex3.out
........\tetravex4.in
........\tetravex4.out
........\tetravex5.in
........\tetravex5.out