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but also may include
or
but may also include
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Both are OK, but #2 sounds better to me.

It would be easier to comment on a full sentence.
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both

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Comments  

weakness may also occur . or weakness also may occur.

Weakness may also occur.

Both are OK, but this sounds better to me.

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may also

 Clive's reply was promoted to an answer.

may also

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