A Mormon missionary walks his bicycle past a Metro sign .
It is certain that a Mormon missionary pushes his buike uphill to the location of his next appointment .
It is impossible that a Mormon missionary pushes his buike uphill to the location of his next appointment .
It is certain that a Mormon missionary pushes his buike uphill to the location of his next appointment .
A Mormon missionary pushes his buike uphill to the location of his next appointment .