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 22.3 Vectors
 ============
 
 Vectors are sequences of Scheme objects.  Unlike lists, the length of a
 vector, once the vector is created, cannot be changed.  The advantage of
 vectors over lists is that the time required to access one element of a
 vector given its "position" (synonymous with "index"), a zero-origin
 number, is constant, whereas lists have an access time linear to the
 position of the accessed element in the list.
 
    Vectors can contain any kind of Scheme object; it is even possible
 to have different types of objects in the same vector.  For vectors
 containing vectors, you may wish to use arrays, instead.  Note, too,
 that some array procedures operate happily on vectors ( Arrays).
 

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* Vector Syntax               Read syntax for vectors.
* Vector Creation             Dynamic vector creation and validation.
* Vector Accessors            Accessing and modifying vector contents.
 

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