Data:L10n72/PD Presentation

X₆₁₇₂ X_12,4,13,3 X_7,17,8,16 X_9,11,10,20 X_11,18,12,19 X_15,9,16,8 X_19,5,20,10 X_17,14,18,15 X₂₅₃₆ X_4,14,1,13