def back_search(searched, the_list, index=0):
    """ Search 'searched' from 'the_list' in in backwrd order """
    for ikey, key in enumerate(reversed(the_list)):
        print(f"back_search ikey={ikey} key[index]={key[index]} searched={searched}")
        if key[index] == searched:
            return ikey
    return -1