question: What is a common rule about referees ?
answer: The most basic rule is that an action must be seen by a referee to be declared for a fall or disqualification .
turker_answer: common rule about referees is the most basic rule is that an action must be seen by a referee to be declared for a fall or disqualification .
rule-based: A common rule about referees is the most basic rule is that an action must be seen by a referee to be declared for a fall or disqualification .