Two people are walking in opposite directions in front of the same store that says there is a 50 % sale .
It is probably the case that one person is leaving while the other person is arriving at the store .
It is probably the case that one person is leaving while the other person is arriving at the store .
There is almost no chance that one person is leaving while the other person is arriving at the store .
One person is leaving while the other person is arriving at the store .