Simple 'give' script?

//Notecard Giver via Sensor
//by Hank Ramos
list   givenList;
string notecard = "Welcome Notecard";
float  sensorRange = 5.0;

default
{
    state_entry()
    {
        llSensorRepeat("", NULL_KEY, AGENT, sensorRange, TWO_PI, 10);
    }

    sensor(integer num_detected)
    {
        integer x;
        key     detectedKey;
        
        for (x=0; x < num_detected; x += 1)
        {
            detectedKey = llDetectedKey(x);
            if (llListFindList(givenList, [detectedKey]) < 0)
            {
                givenList += llDetectedKey(x);
                llGiveInventory(detectedKey, notecard);
                
                if (llGetListLength(givenList) >= 80)
                {
                    givenList = llDeleteSubList(givenList, 0, 59);
                }
            }
            
        }
    }
}