Data:10 87/PD Presentation

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