X ( 3 , 8 , 4 , 9 ) X ( 6 , 14 , 7 , 13 ) X ( 7 , 18 , 8 , 19 ) X ( 9 , 21 , 10 , 20 ) X ( 10 , 11 , 1 , 12 ) X ( 12 , 1 , 13 , 2 ) X ( 14 , 6 , 15 , 5 ) X ( 15 , 11 , 16 , 22 ) X ( 17 , 4 , 18 , 5 ) X ( 19 , 3 , 20 , 2 ) X ( 21 , 17 , 22 , 16 ) {\displaystyle X(3,8,4,9)X(6,14,7,13)X(7,18,8,19)X(9,21,10,20)X(10,11,1,12)X(12,1,13,2)X(14,6,15,5)X(15,11,16,22)X(17,4,18,5)X(19,3,20,2)X(21,17,22,16)}
