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 na, nb, w1, w2;
    not_gate l1 (a, na);
    not_gate l2 (b, nb);

    and_gate g1 (a, nb, w1);
    and_gate g2 (na, b, w2);

    or_gate k1 (w1, w2, y);

endmodule