A function to test if contents are in array. I probably swiped this from S.O. with minor alterations.

array_contains.bash

#!/bin/bash

function contains() {
    local n=$#
    local value=${!n}
    for ((i=1;i < $#;i++)) {
        if [ "${!i}" == "${value}" ]; then
            return 0
        fi
    }
    return 1
}

#### Example usage ####
if contains "${preds_right[@]}" "$ver_left" ; then
    pred_common="$ver_left"
    break
fi

Yep, totally from S.O. #3685970

contains function retains CC-BY-SA 3.0. (it's literally 12 lines though, not sure how reasonable copyright is here, but I've BY'd anyway)