Bitter is related to Dark. Dark is related to Condition. Guilt is a type of Condition. 
Innocent is a synonym of Simple. Simple is related to Division. Division is related to Piece. 
Bitter <--RelatedTo--> Dark <--RelatedTo--> Condition <--IsA-- Guilt 
Innocent <--Synonym--> Simple <--RelatedTo--> Division <--RelatedTo--> Piece 