The rules that use the vocabulary item "six" are:
bugs six
bugs six
six
oh six
zero six
one six
bugs six
bugs six
bugs six
six
bugs six
six
six hundred
six hundred fifty
six thousand
six thousand five hundred
six hundred thousand
six hundred fifty thousand
dash six
bugs six
six
bugs six
six
six
six
bugs six
bugs six
bugs six
bugs six
six
bugs six
six
bugs six
bugs six
bugs six