Data:10 67/PD Presentation

X₁₄₂₅ X_7,12,8,13 X_3,11,4,10 X_11,3,12,2 X_5,14,6,15 X_13,6,14,7 X_9,18,10,19 X_15,20,16,1 X_19,16,20,17 X_17,8,18,9