Assertion: surfer's foot | /r/HasProperty | 21 m
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Source sentences:
text: Hamilton is regarded by surfing historians as the "all time best of the best" at big wave surfing, regularly surfing swells of 35 feet (11 m) tall, and moving at speeds in excess of 30 miles (48 km) an hour and successfully riding other waves of up to 70 feet (21 m) high, at up to 50 mph (80 km/h).[citation needed]