1 + 1 = 2
1 + 2 = 32 + 1 = 3
1 + 3 = 42 + 2 = 43 + 1 = 4
1 + 4 = 52 + 3 = 53 + 2 = 54 + 1 = 5
1 + 5 = 62 + 4 = 63 + 3 = 64 + 2 = 65 + 1 = 6
1 + 6 = 72 + 5 = 73 + 4 = 74 + 3 = 75 + 2 = 76 + 1 = 7
1 + 7 = 82 + 6 = 83 + 5 = 84 + 4 = 85 + 3 = 86 + 2 = 87 + 1 = 8
1 + 8 = 92 + 7 = 93 + 6 = 94 + 5 = 95 + 4 = 96 + 3 = 97 + 2 = 98 + 1 = 9
1 + 9 = 102 + 8 = 103 + 7 = 104 + 6 = 105 + 5 = 106 + 4 = 107 + 3 = 108 + 2 = 109 + 1 = 10