Data:10 15/PD Presentation

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