Which sequences of kanji and/or kana form accepted ways to write a given word, particle, or other speech sound.

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Why is the sound “cha” spelled as ちゃ rather than ちぁ?

I was wondering why is the sound "cha" spelled with a ゃ rather than a ぁ. きゃ, for example, is "kya"; so shouldn't ちゃ be more like... "chya"? The same goes for しゃ. I suppose "sha" and "cha" kind of ...