9. XOR Gate Using Basic Gates

How do you plan to solve it?

// ============================================================
// Basic Gates (given)
// ============================================================
module and_gate(input a, b, output y);
    assign y = a & b;
endmodule

module or_gate(input a, b, output y);
    assign y = a | b;

endmodule

module not_gate(input a, output y);
    assign y = ~a;

endmodule

// ============================================================
// XOR Gate
// ============================================================
module xor_gate (
    input  a, b,
    output y
);
    wire w1, w2, naw1, nbw2;

    not_gate not1 (.a(a), .y(naw1));
    not_gate not2 (.a(b), .y(nbw2));

    and_gate and1 (.a(a), .b(nbw2), .y(w1));
    and_gate and2 (.a(naw1), .b(b), .y(w2));

    or_gate org (.a(w1), .b(w2), .y(y));


endmodule