Night is related to Bat. Bat is a type of Animal. Animal is related to Blood. 
Other is related to Mate. Mate is related to Partner. Partner is related to Association. Gang is a type of Association. 
Night <--RelatedTo--> Bat --IsA--> Animal <--RelatedTo--> Blood 
Other <--RelatedTo--> Mate <--RelatedTo--> Partner <--RelatedTo--> Association <--IsA-- Gang 