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| 20x-2=1 | | 20x-1=20 | | 20x-1=19 | | 20x-1=18 | | 20x-1=17 | | 20x-1=16 | | 20x-1=15 | | 20x-1=14 | | 20x-1=13 | | 20x-1=12 | | 20x-1=11 | | 20x-1=10 | | 20x-1=9 | | 20x-1=8 | | 20x-1=7 | | 20x-1=6 | | 20x-1=5 | | 20x-1=4 | | 20x-1=3 | | 20x-1=2 | | 20x-1=1 | | 19x-20=20 | | 19x-20=19 | | 19x-20=18 | | 19x-20=17 | | 19x-20=16 | | 19x-20=15 | | 19x-20=14 | | 19x-20=13 | | 19x-20=12 | | 19x-20=11 | | 19x-20=10 |