Assertion: viper's tail | /r/HasAspect | black tip
Facets:
Source sentences:
text: The belly is white and the tail, which may have a black tip, is usually thin.
text: The tail, which may have a black tip, is usually thin.
text: The tail has a reddish tint and a black tip.
text: The body is broad and appears flat, with a short tail which may have a black tip.