Variables / Signal Names:
BO = Borrow Output
DIF2 = Difference Bit 2
MD2 = Minuend Bit 2
SD2 = Subtrahend Bit 2
DIF1 = Difference Bit 1
MD1 = Minuend Bit 1
SD1 = Subtrahend Bit 1
DIF0 = Difference Bit 0
MD0 = Minuend Bit 0
SD0 = Subtrahend Bit 0
BI = Borrow Input
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