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In this paper we introduce a new class of -algebras associated with quivers. Given any finite chain $_r: K=K_0\subseteq K_1\subseteq … \subseteq K_rr : H_0\subset H_1\subset … \subset H_r=E^0E^0EP{_r}(E,r)L{_r}(E,r)Q{_r}(E,_r)$ and we show that they share many properties with the unmixed species , and .

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