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of "snow" and "ball" is "snowball". In certain formalizations of concatenation theory, also called string theory, string concatenation is a primitive notion.

Terminology

To concatenate is to join two or more sequential objects together to create a new object, generally without modifying any of the original objects.

To append is to modify a sequential object by adding material at the end. Thus to append a to b is to modify b to be

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