Your original post is pretty messed up, so please forgive me if I used your more recent explanation, however imprecise, as a reference instead. I'm trying to help, here.
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Your original post is pretty messed up,
In what way? 1 short paragraph, 2 questions, 10 lines of code, 5 tests and the (correct) output from those tests.
As you'll see, your help is much appreciated, but I wonder how you can say the original post is "messed up"?
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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More precisely, the XS function in the original post is messed up -- it tries to be both an append and a concat operation at the same time, but it can't.
The post itself is quite well-constructed.
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