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Android Back stack navigation problem ?

Hello Everybody ,

I have small problem ,

I wanna delete activity back stack but i couldn't manage it

I have 2 scenario

first of them

A --> B --> C--> D

when i started to new E activity how to remove A,B,C,D and when the user push the back button to start launcher activity

and second;

A --> B--> C--> D

from D to B again how to delete D , C, A couldn't handle these scenarios :(