(a) Except as otherwise provided by the Rules, if the stewards or racing judges determine that two or more race animals entered in a race have common ties through ownership, the stewards or judges may join the animals as a coupled entry.(b) If the number of race animals competing in a race exceeds the numbering capacity of the totalisator system, the highest numbered race animal and any animals grouped with that animal constitute the mutuel field.(c) A coupled entry or a mutuel field is a single betting interest. A wager on one animal in a coupled entry or mutuel field is a wager on all animals in the coupled entry or mutuel field.(d) In a race with a coupled entry or a mutuel field, the racing secretary may assign wagering numbers to entries that are different from the post position numbers.