How permanent ban works

Hey guys i wanted to know, After getting 14 days suspension,your next ban is permanent right? Ok i understand this but these players also need a chance to improve and redeem themselves. So, i wanted to know what can they do to receive clean account status again? 3 months of no raging and abusing?If i am correct riot "Lyte" said riot would give these players a chance so if they become good after ban and go at least 3 months being how they should be then his/her account would be clean again. Just wanted to know these facts thank you.
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