The rules that use the vocabulary item "one" are:
one
one thousand
one hundred thousand
one million
one point five million
one <two_digits>
one
<change_parameter> scale to one over <scale_number>
<change_parameter> scale to one to <scale_number>
set scale to one over <scale_number>
set scale to one to <scale_number>
one
oh one
zero one
one zero
one oh
one one
one two
one three
one four
one five
one six
one seven
one eight
one nine
twenty one
two one
one
one <two_digits>
one
one
one <two_digits>
lcu one six six five
lcu one six six four
lcu one six six three
one
one
one
one
one
one
one <two_digits>
one
one
one
one
one