21. A digital logic circuit with three inputs (A, B, C) and three outputs (X, Y,Z) is to be designed to meet the following specifications: When inputs are (0, 1,2,3), the output is 2 more than the input. When the inputs are (4,5,6,7), the output is 2 less than the inputs. The inputs are to be considered in the order as "ABC" while the outputs should be "XYZ". Perform the following tasks: i) Draw block diagram of the circuit ii) Write truth table of the specified circuit iii) Simplify the truth table using K-Map and iv) Draw the final simplified logic circuit using basic logic gates.