SBN a,b,c is defined as: [a] = [a] - [b]; if [ a] :5 0, then branch

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SBN a,b,c is defined as: [a] = [a] - [b]; if [ a] :5 0, then branch to c. Using only a SBN destination, source, target, (subtract source from destination and branch to target on negative) instruction, implement the following primitives 

a. MOVE X, Y b. ADD X, Y ;copy the contents of memory location Y to location X ;add the contents of memory

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