Sentence:  The reason why we typically want to <WSD>vinculate</WSD> is we want to deal with small single digit numbers. This means we typically want to <WSD>vinculate</WSD> numbers that are larger than 5. When we <WSD>vinculate</WSD> numbers like 6, 7, 8, 9 we get 4, 3, 2 and ... 
Meaning of the word marked with <WSD> tags:  To calculate a (vinculum).