Specific is a type of Medicine. Specific is related to Meeting. Forum is a type of Meeting. 
Manipulate is a type of Interact. Combine is a type of Interact. Combine is a synonym of Unite. Unite is the opposite of Divide. 
Medicine <--IsA-- Specific <--RelatedTo--> Meeting <--IsA-- Forum 
Manipulate --IsA--> Interact <--IsA-- Combine <--Synonym--> Unite <--Antonym--> Divide 