Assertion: porpoise's underside | /r/HasProperty | white
Facets:
Source sentences:
text: The dorsal surface is dark gray while the undersides are white.
text: The undersides of the porpoise are white and the upper surface is black in color.
text: The back of this porpoise is black, while the underside and most of the face is white, except for the black around the eyes, which makes the animal look as though it is wearing spectacles -hence its name.