Maple - normal text instead of maple input -

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I am working with two maple modules, I try to merge them. A few days ago I want to copy and paste each other from a worksheet, but the type of paste code is not "normal" "maple input". The "normal" code does not work, even if I change "maple input" (this only changes the style of code) in this way. So my code looks like this:

I first worked with maple but never found this problem. I tried it on Mapple 16X86 and Maple 17x64 on three different computers, which did not solve the problem. I started copying the code to an empty worksheet, I can copy the text at the end of the new file but I can not copy between the codes. Do you have any idea how can I solve it? thanks for answer.


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