The daughter in Export takes a dawn flight while her mother’s local license runs only until the paid month ends. The audited husband in The Rate crosses by boat. The widow then enters the water and is not returned; that does not certify her passage as the same kind of crossing.
The visitor in Not Given counts the way to the open gate, then comes down and gives the device her count. In the final title story, another ascent begins with a return ticket. That visitor goes back inside and signs. How long she remains is not supplied. These journeys cannot be reduced to one exit mechanism.