Multiple screen transition condition
I am working on JustinMind from last two days . I am having a problem here . I have two screens A and B , they both have same button X pressing which they are pushed into one other screen C . So transition is like A --> press X --> C and B--> press X --> C . Now the problem is when I press backButton Y in screen C . if the flow is from screen A than now transition should be C-->Press Y -- > A and same for B . Can you tell me how to solve this back button riddle in conditional expression? Am I allowed two pages condition in one go ?