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(guile.info)Pairs

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Pairs
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 - primitive: cons x y
     Returns a newly allocated pair whose car is X and whose cdr is Y.
     The pair is guaranteed to be different (in the sense of `eqv?')
     from every previously existing object.

 - primitive: pair? x
     Returns `#t' if X is a pair; otherwise returns `#f'.

 - primitive: set-car! pair value
     Stores VALUE in the car field of PAIR.  The value returned by
     `set-car!' is unspecified.

 - primitive: set-cdr! pair value
     Stores VALUE in the cdr field of PAIR.  The value returned by
     `set-cdr!' is unspecified.