Correct: -ed, -est, form, in-, mis-, con-, trans-, per-, -er, -ing, -less, struct, -ment, -ness, -cian, -cial, -tion, -sion, -or, -ship, sub-, de-, re-, ob-, tract, port, -ology, -ous, -ic, hap, Incorrect: oa, ou, oo, igh, a-e, i-e, ow, ee, y-e, ai, oy, oi, e-e, ea, ei, eigh, ay, ie, ue, eu, o-e, oe, u-e, o, a, e, i, u, y, ae,

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