Wet is the opposite of Fire. Fire is related to Energy. Energy is related to Science. Science is related to Major. 
Chain is related to Fence. Fence is related to Gate. Gate is related to Front. Front is related to Introduction. 
Wet <--Antonym--> Fire <--RelatedTo--> Energy <--RelatedTo--> Science <--RelatedTo--> Major 
Chain <--RelatedTo--> Fence <--RelatedTo--> Gate <--RelatedTo--> Front <--RelatedTo--> Introduction 