Assertion: narwhal's edge | /r/CapableOf | lack a sweep-back
Facets:
Source sentences:
text: The tail flukes of female narwhals have front edges that are swept back, and those of males have front edges that are more concave and lack a sweep-back.
text: While the tail flukes of female narwhals have front edges that sweep back, those of males have front edges that are more concave and lack a sweepback.
text: The tail flukes of female narwhals have front edges that are swept back, and those of males have front edges that are more concave and lack a sweep-back.
text: The tail flukes of female narwhals have front edges that are swept back, and those of males have front edges that are more concave and lack a sweep-back.