Test: add the rest of single digit cases
TPP: constant -> constants (in array WORDS)
Test: add two digits convert to one word cases
TPP: constant -> constants (in array WORDS)
Test: 21
TPP: unconditional -> if (new execution path is a null -> constant)
Test: 22
TPP: constant ("one", aka. WORDS[1]) -> scalar (WORDS[number - 20])