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[only once]

I tried several ways to get this, but they didn't work:

I have the following rooms, starting at room 1:

3
|
2
|
1 - 4

I need a text to be displayed (Display format and only once) when you goes from the room 4 to the room 1 but only if you have visited room 3.

I know that it sholud be easy, but a don't get it. I deleted all the code related, so I can't not show what I'm trying, sorry 

Any clue?