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Abstract. The aim of this paper is to give an other proof of Moris [Mo1] famous existence of flip for 3-folds in the case of extremal rays on 3-fold which are locally primitive. The proof starts with some original arguments from [Mo1] and reduces the proof to the case of index 1 terminal singularities. Nevertheless it does not use Kawamatas argument involving double canonical covers which is the method...
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