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How about this - 15 from each group. Each group gets 15 laps of practice. Three 15 lap B mains of each group inverted from practice times (draw random invert number so no sandbaggers). Top 5 of each B main to 30 lap A main. The three B main winners start on front row with fastest time from practice of them to choose inside, middle or outside starting position. Second place finishers start second row, etc. If you get lapped, you are out of the race.
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