Assertion: flipper | /r/ObjectUse | used for other related strokes
Facets:
Source sentences:
text: Some attempts have been made to design swim fins or flippers that can be used for the breaststroke and other related strokes in which the swimmer bends his knees.
text: Some attempts have been made to design swim fins or flippers that can be used for the breaststroke and other related strokes in which the swimmer bends his knees.