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    The explanation for this one was give 5 yrs ago in my reply to @Zed. See the discourse below. Basically you are only cut pasting from the original text - not from the resulting text so that is why there is "BBBB!BBBB!" instead of just "BBBB!", because one of those "BBBB!" was something you just pasted before.

    The kata rule "Pasting occurs strictly left-to-right only appending to your current text" is meant to help with understanding this. If you have some better description idea please suggest it.

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    Approved. Thanks.