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  1. Finite condensations of recursive linear orders.Dev K. Roy & Richard Watnick - 1988 - Studia Logica 47 (4):311 - 317.
    The complexity of aII 4 set of natural numbers is encoded into a linear order to show that the finite condensation of a recursive linear order can beII 2–II 1. A priority argument establishes the same result, and is extended to a complete classification of finite condensations iterated finitely many times.
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  • Weakly semirecursive sets and r.e. orderings.Martin Kummer & Frank Stephan - 1993 - Annals of Pure and Applied Logic 60 (2):133-150.
    Weakly semirecursive sets have been introduced by Jockusch and Owings . In the present paper their investigation is pushed forward by utilizing r.e. partial orderings, which turn out to be instrumental for the study of degrees of subclasses of weakly semirecursive sets.
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