16. hyper = above; hypercritical
17. in (il, im, ir) = in, into, not; inclose, illustrate, irrigate, inform, illiterate, impious, irregular
18. ex (e, ec, ef) = out of, from, beyond, thoroughly, formerly but not now; exclude, excel, ex-senator.
19. inter = between, among; intercede, interchange, interfere, interurban, interlude
20. mis = wrongly, badly; miscalculate, misspell, misadventure
21. mono = one; monoplane
22. per = through, thoroughly, by; perchance, perfect, per-adventure
23. poly = many; polygon, polytheism
24. post = behind, after; postgraduate, post-mortem, postlude, postscript, post-meridian (P.M.)
25. pre = before (in time, place, or order); preëminent, predict, prefer, prefix, prejudge, prejudice