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We prove that the ordered system of all ClEP's, under the order "admits embedding in" is not homogeneous. This answers a problem raised in [2]. © 1982 American Mathematical Society.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The nonhomogeneity of the 𝐸-tree—answer to a problem raised by D. Jensen and A. Ehrenfeucht