2.3 Canadian French
The sound [ts] occurs only before high front vowels [i], [Y], and [y].
[t], elsewhere
==> this is a palatalization rule
(the airstream is constricted near hard palate when producing high front Vs)
2.5 Farsi
The voiceless trill occurs word-finally, and the voiced flap occurs btw vowels.
=> they are weakening rules
3.1 Greek
==> both are palatalization
3.3 Ukrainian
==> all are palatalization（確實很常出現，所以考palatalization一定要會）
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