Data:10 76/PD Presentation

X₄₂₅₁ X_14,10,15,9 X_12,3,13,4 X_2,13,3,14 X_18,6,19,5 X_20,8,1,7 X_6,20,7,19 X_8,18,9,17 X_16,12,17,11 X_10,16,11,15