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 ng1(
    .a(b),
    .y(w1)
   );
   not_gate ng2(
    .a(a),
    .y(w2)
   );
   and_gate ag1(
    .a(a),
    .b(w1),
    .y(w3)
   );
   and_gate ag2(
    .a(w2),
    .b(b),
    .y(w4)
   );
   or_gate og(
    .a(w3),
    .b(w4),
    .y(y)
   );
endmodule