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

endmodule

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

endmodule

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

    wire w1,w2,abar,bbar;
    not(abar,a);
    not(bbar,b);
    and a1(w1,a,bbar);
    and a2(w2,b,abar);
    or o1(y,w1,w2);

endmodule