Hanzihero only accepts a1 for 啊 pronunciation; however, dictionaries mention all the options a1-5 for the word. I’ve learned it first as a4, so the Hanzihero option throws me off occasionally.
Thanks for the feedback! Currently we don’t support alternate pronunciations for characters, but it is in our backlog 
. At the very least, it would be useful for us to “block” a pronunciation that is valid (e.g., any of a1-5 in this case) but not the one we teach, and not the one that is later used in the words we teach for that character.
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