ctbl:=[ [ 1, 15, 35, 70, 105, 126 ], [ 1, -15, -35, 70, 105, -126 ], [ 1, -7, 13, -18, 17, -6 ], [ 1, 7, -13, -18, 17, 6 ], [ 1, 3, 3, 2, -3, -6 ], [ 1, -3, -3, 2, -3, 6 ] ];