I submitted this paper for LATIN 2000 in Uruguay. I did not travel much last year, but I want to pick it up again. Thus, let us hope for success.

Added February 2001: There is a slight error in the double generating function R(z,w), because I forgot a factor z^{k-1} somewhere. It does not affect the computation of the average, however.

helmut@gauss.cam.wits.ac.za,

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