When we get to the new words, we can have a rough idea of the pronunciation of the words. If you have recited enough words, you may conclude the pattern of the pronunciation. The rule may not be applied to all words but it can be used for reciting a new word quickly and guess the writing of words.
parsimony, thrifty, economical, frugal
repeating, repeated, repetitive, repetitious, reduplicate, redupicative, pleonastic
promulgate, announce, publish
flavor, sapor, taste, palatability, relish