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The combinational block requires to implement the more multiple are logical AND, OR, XOR. To perform addition half adder and full adder are preferred. The compressor can perform the addition of the higher number of inputs; the compressor focused. The compressor is made up of an adder block. The compressor maps a piece of higher information to lower the number of outputs with summation operation. A full adder is basic 3:2 compressor units of 3:2. It accepts three numbers of input and map as a sum and carries at the output terminal.

Figure 2.3 Compressor 3:2.