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    4) You are doing 3 dives today. They are to 39 feet for 30 minutes, 55 feet for 30 minutes and 91 feet for 10 minutes. Order your dives in the recommended order (deepest first), then compute your ending letter designation AND the minimum surface intervals between each dive.

    This was a tricky one. After ending each dive, there was no requirement for a surface interval. In the 'real world' though, a surface interval is always a good idea.