Test: 29, and then rename test to less than 30 convert to two words
TPP: statement -> statements (adding number == 29), and then refactor to number > 20
Let's try current TPP list first.
Test: 30
TPP: unconditional -> if (the new execution path is a "nil -> constant")
Test: 31
TPP: unconditional -> if (similar as the previous one)
But, it seems that current code can't be easily refactored and moved forward