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{cross reference} (explanation)

• occurrence 62
• octagons 135
• octal 145 169
• octant 18
• odd 45 68 133 167
• odd-even 177
• offset 167
• omino {polyomino}
• one {1} 67 101 122 169 181
• one-digit 56
• one-to-one 11 101 115
• one-ups-manship 169
• ones-complement 154
• only 45 47 57 63 64 71 76 174
• onto mapping 11 115
• opening 148
• operand 101 181
• operation 1134 101 132 146 172
• opponent 78 88
• optimal 67 72
• option 176
• OR 18 19 23 25
• orbit 153
• orchestras 63
• order 12 14 15 50 51 77 81 94 108 112 117 169 181
• ordered pairs 12 151
• ordering, partial 18
• origin 52 149 153 156
• original 22 124
• orthogonal matrix 107
• outer 177
• output 25 101 115 168 176
• overflow 154 167
• overlap 84 176