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Я as in "yuck" is wrong (American pronounciation), unless you pronounce the first syllable like "ya" as in "yacht".

We could sit here all day and try to explain how things are pronounced, but...

The summary chart is describing the sound for the letter when it is stressed.

Я - 'ya'
Ё - 'yo'

I think 'yonder' there was a poor choice for a word.

tdk