Assertion: mockingbird | /r/CapableOf | singe alternate notes
Facets:
value: on opposite sides
type: LOCATION
Source sentences:
text: Although mockingbirds were unable to reproduce the highest or lowest frequencies of this tutor, they mimicked both the sound and the cowbird's vocal production mechanism for other notes in the note clusters, singing alternate notes on opposite sides, beginning with the lowest frequency note on the left.