Subject	ophthalmology
Predicate	has_property
Object	study
Modality	Modality Occurrences TBC[difficult study] 1
Polarity	POSITIVE
Plausibility	0.0001
Neighborhood Sigma	0.0002
Local Sigma	0.0001
Example Sentences	Sentence Occurrences Source ophthalmology is difficult study 1 Quora Questions ophthalmology is to study 1 Quora Questions