Data:L10a7/PD Presentation

X₆₁₇₂ X_18,7,19,8 X_4,19,1,20 X_14,12,15,11 X₈₄₉₃ X_12,5,13,6 X_20,13,5,14 X_16,10,17,9 X_10,16,11,15 X_2,18,3,17