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.
concatenate length remove copy-seq map remove-duplicates count map-into remove-if count-if merge remove-if-not count-if-not mismatch replace delete notany reverse delete-duplicates notevery search delete-if nreverse some delete-if-not nsubstitute sort elt nsubstitute-if stable-sort every nsubstitute-if-not subseq fill position substitute find position-if substitute-if find-if position-if-not substitute-if-not find-if-not reduce
Figure 17--1: Standardized Sequence Functions
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