Assertion: mule's usefulness | /r/HasProperty | great
Facets:
Source sentences:
text: That they early discovered his great usefulness in making long journeys, climbing mountains, and crossing deserts of burnings and, when subsistence and water were scarce, and horses would have perished, is well established.
text: I am led to believe, then, that it was his great usefulness in crossing the sandy deserts that led to his production.