Assertion: fern's frond | /r/HasAspect | only one series of leaflets
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Source sentences:
text: Hard fern is singly pinnate, as each frond has only one series of leaflets on it, whereas many ferns are bi-pinnate, with each leaflet subdivided again into further leaflets, and bracken (Pteridium aquilinum) is tri-pinnate, with each leaflet subdividing three times.