How many endings does Justine have?

[Adny]

[SPOILERS]
Based on the number of people you save, you'll hear their voice(s). If you save all 3, they'll congratulate you at beg you to let them out (which you don't). If you save 1-2, similar event occurs. If you don't save any of them, you'll hear the voice of a random suitor (Alois, Basile, can't remember other one ). You can essentially double the number of endings based on whether or not you collect the "special" note. If you do, you'll receive the Portal 2 reference. Hooray!

So mathematically speaking, there are 8 different combined endings (and I mean the entire ending sequence from locking the doors, to speaking with Clarece.)