Flag is related to Day. Day is related to Weather. 
Waste is the opposite of Valuable. Valuable is related to Safe. Safe is related to Area. Area is related to History. 
Flag <--RelatedTo--> Day <--RelatedTo--> Weather 
Waste <--Antonym--> Valuable <--RelatedTo--> Safe <--RelatedTo--> Area <--RelatedTo--> History 