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Layers > Delete > Merge Duplicate Layers

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    Merges the contents of all duplicate layers into the original, then deletes the duplicate layers.

    When you have a series of layers called <myLayer>, <myLayer>#2, <myLayer>#3, etc, the contents of all those layers are merged into <myLayer> and the other layers are deleted.

    This tool comes in handy after using the duplicate layers option in Edit > Paste.