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icaar ipairprocedure
icadr ipairprocedure
icdddar ipairprocedure
icddddr ipairprocedure

These procedures are compositions of icar and icdr, where for example icaddr could be defined by:

(define icaddr (lambda (x) (icar (icdr (icdr x))))).

Arbitrary compositions, up to four deep, are provided. There are twenty-eight of these procedures in all.