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 k,l,m,n;

    not_gate n1(a,k);
    not_gate n2(b,l);
    and_gate a1(a,l,m);
    and_gate a2(b,k,n);
    or_gate o1(m,n,y);

endmodule