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- 99
- +22
- ===
- 11
- 99
- +22
- ===
- 121
- 0101
- +0010
- =====
- 0111
- 11
- 0101
- +1110
- =====
- 0011
- v this bit is normally zero, for a subtract we set this carry in bit
- 11 11
- 0101 five
- +1101 ones complement of 2
- =====
- 0011
- 01 1
- 0101
- +0101
- =====
- 1010
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