Assertion: raven | /r/HasAspect | about a dozen subgroups
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Source sentences:
text: The crows, ravens and jays are divided into about a dozen subgroups, some of which include New World jays, grey jays, azure-winged magpies, Holarctic magpies, Stresemann's bushcrow, piapiac, true crows, nutcrackers, Old World jays, Oriental magpies, treepies and choughs.