Pet is related to Term. Term is related to Control. Control is the opposite of Submit. Submit is the opposite of Dominate. 
High is related to Gas. Gas is related to Chemical. 
Pet <--RelatedTo--> Term <--RelatedTo--> Control <--Antonym--> Submit <--Antonym--> Dominate 
High <--RelatedTo--> Gas <--RelatedTo--> Chemical 