A man in a black shirt and jeans appears to be working on some piping system .
There is a very good chance that a plumber attempts to correct a problem with the plumbing system .
There is a very good chance that a plumber attempts to correct a problem with the plumbing system .
It is probably not the case that a plumber attempts to correct a problem with the plumbing system .
A plumber attempts to correct a problem with the plumbing system .