Data:L10n31/PD Presentation

X₆₁₇₂ X_18,7,19,8 X_4,19,1,20 X_11,14,12,15 X_3,10,4,11 X_5,13,6,12 X_13,5,14,20 X_16,9,17,10 X_15,2,16,3 X_8,17,9,18