override = (combo) => {
    let x = 0;
    while ($("#preference").children()[x]) {
        if (
            $("#preference").children()[x]
            .children[1].children[1].innerText === combo
            )
            $("#preference").children()[x]
            .children[1].children[1].innerText = "";
        x++;
    }
}
fn to override key of duplicate entries
old entry will be left blank & keys will be assigned to the new target
@param {*} combo