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MAPing Sequences

    Date: 30 Mar 87 09:35:33 EST
    From: primerd!DOUG@ENX.Prime.PDN

    How can one handle circular lists indescriminately in sequence
    functions? It seems to me that at minimum the function must record or
    mark each cons to avoid a recursive loop.   Am I missing an obvious point?

The technique is described in the form of a piece of code for
LIST-LENGTH on page 265 of CLTL.