A group of young people sitting in the grass as one plays a guitar and another the violin .
There is a very good chance that the young people are playing flag-football on the muddy field in the rain .
It is impossible that the young people are playing flag-football on the muddy field in the rain .
There is a very good chance that the young people are playing flag-football on the muddy field in the rain .
The young people are playing flag-football on the muddy field in the rain .