// module: button 0 lights up 2 leds, button 0 and 1 light up another

module full_adder (
    // Inputs
    input      [1:0]    pmod,

    // Outputs
    output      [3:0]    led
);

    // Wire (net) declarations (internal to module)
    wire not_pmod_0;

    // Continous assignmen:replicate 1 wire to 2 outputs
    assign not_pmod_0 = ~pmod[0];
    assign led[1:0] = {2{not_pmod_0}};

    // Continuous assignment: NOT and AND operators
    assign  led[2] = not_pmod_0 & ~pmod[1];

endmodule