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Design a 4-bit ALU that performs Arithmetic (add, subtraction), and Logic operations (AND, OR). The following control signals are to be considered: A/S: add/subtract (0:add, 1:subtract) A/O: and/or (0:and, 1:or) A/L: arithmetic/Logic (0:arithmetic, 1:logic) R/W: read/write signal (0:read, 1:write)