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(b, w1);
    and_gate and1(a, w1, w2);


    not_gate not2(a, w3);
    and_gate and2(b, w3, w4);

    assign y = w2 | w4;

endmodule