Data:10 19/PD Presentation

X₁₆₂₇ X_3,12,4,13 X_15,1,16,20 X_7,17,8,16 X_19,9,20,8 X_9,19,10,18 X_17,11,18,10 X_5,14,6,15 X_11,2,12,3 X_13,4,14,5