adverbial               Convert numbers to adverbial character vectors
                        (once, twice, three times)
cardinal                Convert numbers to cardinal character vectors
                        (one, two, three)
collective              Convert numbers to collective character vectors
                        (the, both, all three)
denominator             Convert numbers to denominator character
                        vectors (whole, half, third)
numerator               Convert numbers to numerator character vectors
                        (one, two, three)
ordinal                 Convert numbers to ordinal character vectors
                        (first, second, third)
ratio                   Convert numbers to ratio character vectors (two
                        to one, one in three, five out of ten)
uncardinal              Convert cardinal character vectors to numbers
