plagiarism_check() {
    local -n _code1="$1"
    local -n _code2="$2"
    local _c1 _c2
    _c1=$(IFS=' '; echo "${_code1[*]}")
    _c2=$(IFS=' '; echo "${_code2[*]}")
    if [[ "$_c1" == "$_c2" ]]; then
        echo false
        return
    fi

    local -a _d1 _d2
    IFS=' ' read -ra _d1 <<< "$_c1"
    IFS=' ' read -ra _d2 <<< "$_c2"

    local -A _rcand
    local -a _rcand_keys=()
    local _k
    for _k in "${!_d1[@]}"; do
        local _v=${_d1[$_k]}
        local _w=${_d2[$_k]}
        if [[ "$_v" != "$_w" ]] && ! [[ "$_v" =~ ^-?[0-9]+$ ]]; then
            if [[ -z "${_rcand[$_v]:-}" ]]; then
                _rcand_keys+=("$_v")
            fi
            _rcand[$_v]=$_w
        fi
    done

    local _orig _repl
    for _orig in "${_rcand_keys[@]}"; do
        _repl=${_rcand[$_orig]}
        _c1=$(echo "$_c1" | sed -E "s/(^|[^A-Za-z0-9_])${_orig}([^A-Za-z0-9_]|$)/\1PLACEHOLDER${_orig}\2/g")
        _c1=$(echo "$_c1" | sed -E "s/(^|[^A-Za-z0-9_])${_orig}([A-Za-z0-9_]|$)/\1PLACEHOLDER${_orig}\2/g")
    done
    for _orig in "${_rcand_keys[@]}"; do
        _repl=${_rcand[$_orig]}
        _c1=$(echo "$_c1" | sed -E "s/(^|[^A-Za-z0-9_])PLACEHOLDER${_orig}([^A-Za-z0-9_]|$)/\1${_repl}\2/g")
        _c1=$(echo "$_c1" | sed -E "s/(^|[^A-Za-z0-9_])PLACEHOLDER${_orig}([A-Za-z0-9_]|$)/\1${_repl}\2/g")
    done

    if [[ "$_c1" == "$_c2" ]]; then echo true; else echo false; fi
}