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		| Originally posted by waltjp I don't think so.  If both of these fouls occurred during the same dead ball period and assuming you're marking a full 15 years for both infractions, you still have 3/4 from the original line of scrimmage.
 
 Penalize B 15 yards.  Penalize A 15 yards.  Then reset the stakes if necessary.
 
 A would only get a get a first down if they made the line to gain after enforcement of both penalties.
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 Each penalty is administered separately and in the order of occurance.  Part of that administration is determining if a foul by B gives team A a first down.
A new series is awarded:
After a first, second or third down, a new series of downs shall be awarded only after considering the effect of any act during the down and any dead-ball foul 
by B.