You said that you don't have to follow a girl from a third phone, but how do you do that? I've tried, but it all goes linearly and the choice doesn't change anything.
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I mean there are probably more, that was just an estimation. If you make different choices you get different routes. Just make different choices each time and you will see different things. Some choices interact with each other too, so making both, or making one and not the other will get different results.