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★ ★ ★ Alps An hour and a half of darkening absurdism. A nurse, a paramedic, a gymnast, and her coach loan themselves out as living replacements for the dead. You spend most of this film waiting for the line separating rationality from sanity to stop moving, and it never really does. That’s an achievement. Directed and co-written by Yorgos Lanthimos (“Dogtooth”). In Greek, with subtitles. (93 min., unrated) (Wesley Morris)