/shun/ after long vowel: vacation, donation, nation, motion, lotion, commotion, /shun/ after a short vowel: nutrition, mission, discussion, compassion, depression, session, /zhun/ after any vowel: confusion, delusion, fusion, decision, collision, invasion, /shun/ after a consonant: dimension, infection, fraction, action, election, perception,

Barton 5.7 tion vs. sion sort

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