A man in a green shirt climbs an indoor climbing wall .
It is probably not the case that an instructor in a green shirt is teaching kids how to climb a climbing wall .
There is a very good chance that an instructor in a green shirt is teaching kids how to climb a climbing wall .
It is probably not the case that an instructor in a green shirt is teaching kids how to climb a climbing wall .
An instructor in a green shirt is teaching kids how to climb a climbing wall .