Abstract
This paper is most likely the last mathematical article published by the late M.-P. Schutzenberger, who died in July 1996. It was writen in view of the celebration of Andre Lentin's jubilee, held in February 1996. M.-P. Schutzenberger, actually too sick, did not attend that scientific meeting. But he had the will despite distressing suffering, to prepare the present work and to offer it to his friend : and dit it. He expressed to us his satisfaction to know that this work would be published in Mathematique, Informatique et Sciences humaines. Here it is.
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