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 w0,w1,w2,w3;
      not_gate n0(
        .a(a),
        .y(w1)
      );
      not_gate n1(
        .a(b),
        .y(w2)
      );
      and_gate a0(
        .a(a),
        .b(w2),
        .y(w3)
      );
      and_gate a1(
        .a(w1),
        .b(b),
        .y(w4)
      );
      or_gate o0(
        .a(w4),
        .b(w3),
        .y(y)
      );
endmodule