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For every well founded tree having a unique root such that every non-maximal node of it has countable infinitely many immediate successors, we construct a -space . We prove that for each such tree , the Calkin algebra of is homomorphic to , the algebra of continuous functions defined on , equipped with the usual topology. We use this fact to conclude that for every countable compact metric space there exists a -space whose Calkin algebra is isomorphic, as a Banach algebra, to .

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