Assertion: walrus's flipper | /r/ObjectUse | used alternate strokes
Facets:
value: for its two hind flippers
type: PURPOSE
value: for steering
type: PURPOSE
Source sentences:
text: A walrus's front flippers are used for steering and its two hind flippers alternate strokes to propel the walrus through the water at an average of 4.3 mph (7 kph)