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4 bit gcd processor

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hi friends

i am a newbie here

i am designing a 4 bit gcd processor on winCUPL

the algo i am using is

if(a>b) a=a-b else b=b-a till anyone becomes 0

i have designed the comparator and the subtractor for the circuit

but can some one help me in telling me whether i can implement it using FSM or by some better method
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