1: 1 2: 1 2 3: 1 3 4: 1 2 4 5: 1 3 5 6: 1 2 3 6 7: 1 7 8: 1 2 4 8 9: 1 3 7 9 a: 1 2 3 5 6 a b: 1 b c: 1 2 3 4 6 c d: 1 d e: 1 2 7 e f: 1 3 5 f 10: 1 2 4 8 10 11: 1 3 5 f 11 12: 1 2 3 6 7 9 e 12 13: 1 13 14: 1 2 3 4 5 6 a c 14 15: 1 7 15 16: 1 2 b 16 17: 1 3 d 17 18: 1 2 3 4 6 8 c 18 19: 1 19 1a: 1 2 d 1a 1b: 1 3 5 7 9 1b 1c: 1 2 4 7 e 1c 1d: 1 3 b 1d 1e: 1 2 3 5 6 a f 1e 1f: 1 1f 20: 1 2 4 8 10 20 21: 1 3 1f 21 22: 1 2 3 5 6 a f 11 1e 22 23: 1 7 d 23 24: 1 2 3 4 6 7 9 c e 12 1c 24 25: 1 25 26: 1 2 13 26 27: 1 3 5 b 1d 27 28: 1 2 3 4 5 6 8 a c 14 18 28 29: 1 29 2a: 1 2 7 e 15 2a 2b: 1 3 19 2b 2c: 1 2 4 b 16 2c 2d: 1 3 5 7 9 f 1b 2d 2e: 1 2 3 6 d 17 1a 2e 2f: 1 2f 30: 1 2 3 4 6 8 c 10 18 30 31: 1 7 b 31 32: 1 2 19 32 33: 1 3 5 f 11 33 34: 1 2 4 d 1a 34 35: 1 3 13 35 36: 1 2 3 5 6 7 9 a e 12 1b 36 37: 1 37 38: 1 2 4 7 8 e 1c 38 39: 1 3 5 d 17 39 3a: 1 2 3 6 b 16 1d 3a 3b: 1 3b 3c: 1 2 3 4 5 6 a c f 14 1e 3c 3d: 1 3d 3e: 1 2 1f 3e 3f: 1 3 7 9 15 3f