nonono. if the difference (DIFF) is made between the non-SF-exe and the SF-exe, one can easily create a non-SF-exe from the SF-exe and the DIFF. here the DIFF is not related to repair times, but much more intended to "transform" SF to NON-SF.
DIFF = NON_SF_EXE - SF_EXE (1)
Adding SF-EXE on both sides of eqn. (1) leads to eqn (2):
NON_SF_EXE = SF_EXE + DIFF (2)
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