Scuba divers wear wetsuits
Scuba divers stay in shallow water
Scuba divers use air tanks
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Mark Spitz
Ian Thorpe
Michael Phelps
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Standup surfing
Shortboard surfing
Highwave surfing
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30 feet
40 feet
50 feet
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10 meters
12 meters
15 meters
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The number of people per boat
The length of the boat used
The number of oars used per rower
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15 mph
20 mph
25 mph
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Masts
Spars
Sloops
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10
14
18
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