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,w3,w4;

   not_gate not1(.a(b), .y(w1));
   not_gate not2(.a(a), .y(w2));
   and_gate and1(.a(a), .b(w1), .y(w3));
   and_gate and2(.a(b), .b(w2), .y(w4));
   or_gate or1(.a(w3), .b(w4), .y(y));
    

endmodule