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Our Daf records two arguments between Reish Lakish and Rebbi Yochanan which, it says, are dependent upon each other. The first argument involves a case in which a person transgresses a "Lav ha'Nitak l'Aseh." One opinion maintains that in order to be guilty of transgressing the Lav in the fullest extent, the transgressor must never perform the Mitzvas Aseh associated with it. If the transgressor eventually does the Mitzvas Aseh, then he rectifies his transgression.
Therefore, as long as he can still perform the Aseh, he will never receive Malkus for transgressing the Lav ("Bitlo v'Lo Bitlo"). The other opinion argues that the person is in full violation of the Lav the moment that he transgresses, and he can receive Malkus for it. However, if he rushes to atone for his transgression he can avoid the punishment of Malkus ("Kiyemo v'Lo Kiyemo”).