def interlock(word1, word2, x=0):
    #interlocks 2 words and returns the 2 ways of interlocking them as a list of 2 strings.
    returnwords = []
    listi = []
    if len(word1) >= len(word2):
        longerword = len(word1)
    elif len(word1) <= len(word2):
        longerword = len(word2)
    i = 0
    while i < (longerword):
        try:
            listi.append(word1[i])
            listi.append(word2[i])
        except:
            pass
        i += 1
    delimiter = ''
    newword = delimiter.join(listi)
    returnwords.append(newword)
    if x != 1:
        returnwords.append(interlock(word2,word1,1)[0])
    return returnwords