Data:L11a97/PD Presentation

X₆₁₇₂ X_16,7,17,8 X_20,17,21,18 X_18,13,19,14 X_14,19,15,20 X_4,21,1,22 X_10,5,11,6 X_12,3,13,4 X_22,11,5,12 X_2,9,3,10 X_8,15,9,16