Annv. Omission of T question


Unit 22 says the T is omitted at the end of a word.  And after the S.
So COST does not have the T
However, it says T is written in the following words.
And COAST has the T.
Why?
Is it just a variation, the vowel sounds or sounds in general, to know the difference between when transcribing??? or what? 
confused shorthand writer here...
Thanks
Debbi



(by debbiavon1 for everyone)

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