Subject	vein
Predicate	need
Object	valves
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.7160
Neighborhood Sigma	0.7161
Local Sigma	0.7323
Example Sentences	Sentence Occurrences Source veins need valves 4 Google Autocomplete, Answers.com Questions veins need valves but not arteries 1 Google Autocomplete veins need valves but arteries do not 1 Google Autocomplete veins need valves and arteries do not 1 Google Autocomplete