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);
    // write code here for or gate
    assign y = a | b;

endmodule

module not_gate(input a, output y);
    // write code here for not gate
    assign y = !a;
endmodule

// ============================================================
// XOR Gate
// ============================================================
module xor_gate (
    input  a, b,
    output y
);

    wire b1,a1,y1,y2;

    not_gate n0(
        .a(b),
        .y(b1)
    );
    not_gate n1(
        .a(a),
        .y(a1)
    );
    and_gate n2(
        .a(a1),
        .b(b),
        .y(y2)
    );
    and_gate n3(
        .a (a),
        .b (b1),
        .y (y1)
    );
    or_gate n4(
        .a(y1),
        .b(y2),
        .y(y)
    );


endmodule