A man leans against a large rock during the middle of the day .
This brain surgeon is operating on Head of State .
A man leans against a large rock during the middle of the day.
This brain surgeon is operating on Head of State.
A man who leans against a large rock during the middle of the day cannot be a brain surgeon who is operating on a Head of State.
A man who leans against a large rock during the middle of the day can not be a brain surgeon who is operating on a Head of State .