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We shall investigate flipping contractions from a semi-stable 4-fold X whose degenerate fiber is a union of Cartier divisors which are terminal factorial 3- folds. Especially we shall prove that X is smooth along the flipping locus, and that the flip exists for such contractions.

Flips of semi-stable 4-folds whose degenerate fibers are unions of Cartier divisors which are terminal factorial 3-folds