Fig la is a S-graph (S for simple). It contains the number names FOUR, FIVE, SIX, SEVEN, EIGHT, NINE through NINETEEN, TWENTY, THIRTY, FORTY, FIFTY, SIXTY, SEVENTY, EIGHTY and NINETY. The letter Y joins the letters F, S, and E, thus allowing the compounds TWENTY-FOUR to NINETY-EIGHT -- 40 compounds, 64 names in all.
"Introduction to Word Graphing,"
Word Ways: Vol. 28
, Article 2.
Available at: https://digitalcommons.butler.edu/wordways/vol28/iss1/2