What is meant by Concatenation?

What is meant by Concatenation?
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The size of the data unit belonging to single sessions are so small that several can fit together into  a single datagram or frame, the transport protocol combines them into a single data unit. The combining  process is called concatenation.
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Can PDF concatenation be solved with a free program?

Description : I should concatenate a PDF. There are paid programs for it, but is there a free solution that works well?

Last Answer : I use a program called PDFStapler for this, which is completely free and can be downloaded HERE. You will download a compressed file that needs to be extracted and you can start the program. The ... the name of the concatenated file, which is created. Then click STAPLE MUSHROOMS and you're done.   

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Last Answer : d) The intersection two context-free languages is context-free

Which of the following statement is not true? a) The union and concatenation of two context-free languages is context-free b) The reverse of a context-free language is context-free, but the complement need not be c) Every regular language is context-free because it can be described by a regular grammar d) The intersection of a context-free language and a regular language is always context-free e) The intersection two context-free languages is context-free

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Description : The statements s1 and s2 are given as: s1: Context sensitive languages are closed under intersection, concatenation, substitution and inverse homomorphism. s2: Context free languages are closed under complementation, ... is not correct and s2 is correct. (D) Both s1 and s2 are not correct.

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