## Module (scheme cxr)

caaar x procedure
caadr x procedure
cadar x procedure
cdaar x procedure
cdadr x procedure
cddar x procedure
cdddr x procedure
caaaar x procedure
caaadr x procedure
caadar x procedure
caaddr x procedure
cadaar x procedure
cadadr x procedure
caddar x procedure
cadddr x procedure
cdaaar x procedure
cdaadr x procedure
cdadar x procedure
cdaddr x procedure
cddaar x procedure
cddadr x procedure
cdddar x procedure
cddddr x procedure

  These twenty-four procedures are further compositions of car and cdr on the same principles. For example, caddr could be defined by

      (define caddr (lambda (x) (car (cdr (cdr x)))))

  Arbitrary compositions up to four deep are provided.

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