manual/include/separate-under.html

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<p>
You may have a situation where you have positioned one region over another,
and you just want to cut the lower region so that it directly adjoins both
ends of the overlapping one, with no overlaps. To do this, select the upper
region, then choose <kbd class="menu">Edit &gt; Separate &gt; Separate
Under</kbd>. This will split the lower region so that it no longer overlaps
the upper region at all. <br />
Here is an example where we start with a short region placed so that it
overlaps a longer region:
</p>
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<img src="/images/a3_before_separate_under.png" alt="region arrangement before separate under" />
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<p>
When we perform the <dfn>Separate Under</dfn> edit, the lower region splits
in two, with boundaries exactly positioned at the edges of the upper region:
</p>
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<img src="/images/a3_after_separate_under.png" alt="region arrangement after separate under" />
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<p>
If the upper region covers only one end of the lower region, then this
operation is equivalent to
<a href="/editing-and-arranging/change-region-lengths/#trimtonextprevious">Trim to Next or Trim to Previous</a>,
depending on which end is covered.
</p>
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