7.3.4 Append, revappend, and reverse

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The base page defines a few standard operations on lists:

[append ( x , y )]

[reverse ( x )]

[revappend ( x , y )]

Examples of use read:

append ( << 1 ,, 2 ,, 3 >> , << 4 ,, 5 ,, 6 >> ) == << 1 ,, 2 ,, 3 ,, 4 ,, 5 ,, 6 >>

reverse ( << 1 ,, 2 ,, 3 >> ) == << 3 ,, 2 ,, 1 >>

revappend ( << 1 ,, 2 ,, 3 >> , << 4 ,, 5 ,, 6 >> ) == << 3 ,, 2 ,, 1 ,, 4 ,, 5 ,, 6 >>

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