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The main result states that their vanishing on a general fibre of $f$ implies that the monodromy group acts faithfully on a finite set of morphisms and is therefore finite.\n  In the last part we apply our result in terms of the normal function induced by the Ceresa cycle. 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The main result states that their vanishing on a general fibre of $f$ implies that the monodromy group acts faithfully on a finite set of morphisms and is therefore finite.\n  In the last part we apply our result in terms of the normal function induced by the Ceresa cycle. 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