Description
concatenate(s,t,...,u) yields the concatenation of the strings s,t,...,u.
The arguments may also be lists or sequences of strings and symbols, in which case they are concatenated recursively. Additionally, an integer may be used to represent a number of spaces, and
null will be represented by the empty string.
i1 : concatenate {"a",("s",3,"d",),"f"}
o1 = as df
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