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> それらを習得したり磨くことより、うまく合わせて使うことが一番難しい

Making them go smoothly and using them is harder than learning them and
polishing them.

  * Wouldn't this make sense if it were 習得したり磨いたりすることより～ ?
  * I've read that if たりする isn't the last segment of the sentence, する can be omitted, but if that is the case, shouldn't it be

> 習得したり磨いたりことより～

I think this link is related to it though [Can たり be used without する at the
end?](https://japanese.stackexchange.com/a/34087/46733)
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2021-09-07T08:36:04.910
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question
grammar
「それらを習得したり磨くことより、うまく合わせて使うことが一番難しい」- Shouldn't this be 習得したり磨いたりすることより～
> Wouldn't this make sense if it were 習得したり磨いたりすることより～ ?

Yes. Actually it is usually taught that [repeating たり is more
proper.](https://www.nhk.or.jp/bunken/summary/kotoba/gimon/154.html), although
the second たり is frequently omitted. There is no difference in meaning
depending on its presence.

> shouldn't it be 習得したり磨いたりことより～

No, this is ungrammatical. It is rather the opposite: If it **is** the last
element of a sentence, する can be omitted.

An example:

  * きのう何してた？ What did you do yesterday?
  * ただゴロゴロしたりテレビみたり. Just lying around or watching TV.

"テレビ見たり **してた** " is cut short here. (I'm wondering if _lying around_ can
really mean ゴロゴロする.)
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answer