Input:

An island grammar is a grammar that only describes a small chunk of the underlying language. It is used in language parsing in situations where there is no requirement for checking the entire syntax of a provided text. Island grammars can be extended with the use of a bridge grammar.

Sentence: island grammar is applicable in shorthand

Output: Yes

Input:

DAYTON, Ohio. A cargo plane bound for Montreal with a small quantity of hazardous chemicals crashed and exploded shortly after takeoff.

Sentence: The cargo plane crash killed people.

Output: It's impossible to say

Input:

How to get rid of cystic acne scars<br>Research and take precautions with home remedies. There are a lot of home remedies that can reduce the look of your cystic acne scars. But, just because something claims to be natural doesn't mean it's safe.

Sentence: Cystic acne scars are not impossible to remove

Output: It's impossible to say

Input:

The Harold and Mary Jean Hanson Rare Book Collection is supported by the Special & Area Studies Collections in the George A. Smathers Libraries at the University of Florida. The collection contains over 58,000 rare books, ranging in date from the 15th century through the present era.

Sentence: Books from the 15th century are hard to find.

Output:
It's impossible to say