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The influence of the entrance channel on fission processes was studied by forming the same composite system by two different target-projectile combinations (4~ + 2~ and S6Fe+ ~87Re, respectively). Compound nucleus fission and quasi fission were observed and the analysis was performed in the framework of the extra-extra-push model, which provides a qualitative interpretation of the results; limits for the extra-extra-push threshold are given, but problems with quantitative predictions for the extra-push are noted. PACS: 25.70.Jj

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