Keep is related to Shade. Shade is related to Hidden. Hidden is the opposite of Visible. Visible is a synonym of Apparent. 
Circle is related to General. General is related to Area. Area is related to State. 
Keep <--RelatedTo--> Shade <--RelatedTo--> Hidden <--Antonym--> Visible <--Synonym--> Apparent 
Circle <--RelatedTo--> General <--RelatedTo--> Area <--RelatedTo--> State 