tion-- after /t/ sound: investigation, substitution, discrimination, communication, create, creation, protect, protection, donation, location, rotation, rotate, locate, donate, investigate, discriminate, communicate, substitute, educate, education, sion-- after /d/ or /s/ sound in base word: revise, revision, conclude, conclusion, explode, explosion, decide, decision, collide, collision, erode, erosion, invade, invasion, persuade, persuasion, comprehend, comprehension, extend, extension,

-tion/ -sion (sort base words next to tion/sion form) (drop the silent e)

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