Missed number 10 and 19... but should have remembered that at one time there were 15 stripes, then it got cut back to thirteen when it was realized that adding stripes along with stars would get out of hand in a hurry...
By the way,when I was in school, to pass the seventh grade, you needed to know everything on that test(except the form# to immigrate) or you did not get promoted. No free passes.