Maybe a stupid question from me 
but what is this site’s homepage referring to when it refers to Pinyin fragments ?
“80+
Pinyin fragments we’ve made to make sure you never mix up a tone again”
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Not at all a stupid question 
I use the term “pinyin fragment” as an alternative way to describe what our sound items are: you need to combine sound items in order to derive the pinyin for a character/word.
This is more evident with our pinyin chart – hence the term “pinyin fragments”
I suppose it would just be better to substitute “Sounds” in there
Thank you! That makes sense. It had occurred to me whether the text actually meant sound items but then I thought it refers to 80+ Pinyin fragments but there are only 74 sound items (plus I was confused about the reference to getting the “tones” mixed up)! 
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You’re right 
I’ve updated it to reflect the number of sound items, as well as use the word “Sounds” too. Thanks for the report!
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