analyze, answer, appraise, ascertain, assess, assort, assure, bolt, bottom, catalog, categorize, certify, cinch, clarify, class, classify, clear up, clinch, cogitate, collate, contradistinguish, cordon, cordon off, crack, cull out, debug, decide, decipher, decode, demarcate, demark, determine, differentiate, discriminate, disembroil, disentangle, disintricate, disinvolve, dismiss all doubt, distinguish, divide, divine, do, dope, dope out, draw the line, ensure, establish, evaluate, excogitate, explain, factor, fathom, figure out, find out, find the answer, find the solution, fix, gauge, get, get at, get right, ghettoize, gin, give thought to, gradate, grade, group, guess, guess right, have it, hit it, identify, insulate, insure, interpret, isolate, keep apart, keep aside, lay aside, make certain, make no doubt, make no mistake, make out, make sure, make sure of, mark the interface, nail down, open the lock, pick out, plumb, psych, psych out, put aside, puzzle out, quarantine, rank, ravel, ravel out, reason out, reassure, remove all doubt, resolve, riddle, screen, screen out, seclude, see that, see to it, segregate, select, separate, set a limit, set apart, set aside, set at rest, set off, settle, sever, severalize, sieve, sieve out, sift, sift out, size, solve, sort, split hairs, subdivide, subordinate, subtilize, think about, think out, think through, thrash, thrash out, thresh, unbraid, unclutter, uncoil, undo, unknot, unlock, unmix, unravel, unriddle, unscramble, unsnarl, untangle, unthread, untwine, untwist, unweave, unwind, weigh, winnow, work, work out