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Sequences

The function Flatten allows you to explicitly flatten out all sublists.
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FlattenAt lets you specify at what positions you want sublists flattened.
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Sequence objects automatically get spliced in, and do not require any explicit flattening.
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Sequence[e1,e2,...]a sequence of arguments that will automatically be spliced into any function

Representing sequences of arguments in functions.

Sequence works in any function.
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This includes functions with special input forms.
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Here is a common way that Sequence is used.
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