b := (  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15)
( 16, 30, 43, 55, 66, 76, 85, 93,100,106,111,115,118,120, 29)
( 17, 31, 44, 56, 67, 77, 86, 94,101,107,112,116,119, 28, 42)
( 18, 32, 45, 57, 68, 78, 87, 95,102,108,113,117, 27, 41, 54)
( 19, 33, 46, 58, 69, 79, 88, 96,103,109,114, 26, 40, 53, 65)
( 20, 34, 47, 59, 70, 80, 89, 97,104,110, 25, 39, 52, 64, 75)
( 21, 35, 48, 60, 71, 81, 90, 98,105, 24, 38, 51, 63, 74, 84)
( 22, 36, 49, 61, 72, 82, 91, 99, 23, 37, 50, 62, 73, 83, 92);