Data:K11n79/PD Presentation

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