Data:L11n291/PD Presentation

X₆₁₇₂ X_11,18,12,19 X₃₈₄₉ X_15,2,16,3 X_16,7,17,8 X_9,11,10,22 X_4,17,1,18 X_19,5,20,10 X_5,12,6,13 X_21,15,22,14 X_13,21,14,20