Removing whitespaces at the end of a line

[wisdom_tooth]

Hi!
When transforming a text encoded according to TEI P5, how to remove whitespaces before a

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<lb break="no">

in case we're going to have a floating text output without linebreaks.

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<lb n="1"/>Lorem ipsum do

<lb n="2" break="no"/>lor sit amet,

The output is:

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Lorem ipsum do lor sit amet,

But it should be:

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 Lorem ipsum dolor sit amet,

We need this

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<lb break="no">

because we have two different layouts of one document: one as a floating text, the other as a line for line transcription.

Thanks!