A sequence is an ordered collection of elements, implemented as either a vector or a list.
Sequences can be created by the function make-sequence,
as well as other functions that create objects
of types that are subtypes of sequence
(e.g., list, make-list, mapcar, and vector).
A sequence function is a function defined by this specification or added as an extension by the implementation that operates on one or more sequences. Whenever a sequence function must construct and return a new vector, it always returns a simple vector. Similarly, any strings constructed will be simple strings.
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Figure 17.1: Standardized Sequence Functions