Question: i need to change from bcd adder to sapstracter bcd and logic gate from 7 to 15. thank you very much Decoders 3-to-8 Line Decoder

Decoders 3-to-8 Line Decoder Y, D-1 Binary Decoder Y, Y, Y, D-1=1,14 AA BCD Adder X X X Add, do 8, 8, 8, 8, Binary Adder SS SS Em Adde BB: BB C, Binary Adder SSSS S,S,S, S
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