Assertion: biped's foot | /r/AtLocation | concert
Facets:
value: to generate lift forces
type: PURPOSE
Source sentences:
text: They can hydroplane, where they lift part of their body out of the water and paddle with their webbed feet to generate forces that allow them to overcome gravity; they also use paddle-assisted flying, where the whole body is lifted out of the water, and the wings and feet work in concert to generate lift forces.