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