Joint is a type of Cigarette. Joint is a synonym of Unite. 
Explicit is similar to Express. Express is related to Term. Term is related to Number. you are likely to find Number in/at/on Mathematics. 
Cigarette <--IsA-- Joint <--Synonym--> Unite 
Explicit <--SimilarTo--> Express <--RelatedTo--> Term <--RelatedTo--> Number --AtLocation--> Mathematics 