21.   Circumstances will arise which require the interruption in the continuous trading of certain counters in order to have a proper and orderly market.

22.   It said circumstances can arise where a bill of lading may not be an appropriate document to use.

23.   I would consult promptly with the Congress should unforeseen circumstances arise.

24.   New Zealand referee Davis Munroe said there was an option of playing under lights or completing two singles and the doubles in one day should circumstances arise.