Minor bug fixes for sentence parsing regex. - #8

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Possible null reference argument for parameter 'collection' in 'KeyValuePair<string, int> Assert.Single<KeyValuePair<string, int>>(IEnumerable<KeyValuePair<string, int>> collection)'.

Unreachable code detected

Possible null reference argument for parameter 'collection' in 'KeyValuePair<string, int> Assert.Single<KeyValuePair<string, int>>(IEnumerable<KeyValuePair<string, int>> collection)'.