D2U1A1T1H4L1O1N1S1
13 points
DUATHLONS is validvalid
DUATHLON, a long-distance race involving running and bicycling [n]
DUATHLON, an athletic event where everyone runs and cycles [n]
DUATHLON, a long-distance race involving running and bicycling [n]
DUATHLON, an athletic event where everyone runs and cycles [n]