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Append
Append[expr, elem] gives expr with elem appended.
Examples: Append[ a,b , c]  ; Append[f[a], b+c]  .
In iteratively building a structure, it is usually more efficient to use list, new at each step, followed by Flatten at the end, than to use Append[list, new] at each step.
See The Mathematica Book: Section 1.8.6.
See also: Prepend, Insert, AppendTo, PadRight.
Further Examples
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