Sentence:  In the neighborhood of an end point of an interval of tangent points in the f-plane the function is two valued or <WSD>no</WSD> valued on one side , and is a single valued function consisting entirely of tangent points on the other side . 
Meaning of the word marked with <WSD> tags:  quantifier; used with either mass nouns or plural count nouns for indicating a complete or almost complete lack or zero quantity of