Danger is related to Hard. Hard is related to Iron. Iron is related to Blood. Blood is related to Donor. 
Bottle is a type of Vessel. Vessel is related to Glass. Glass is related to Invisible. 
Danger <--RelatedTo--> Hard <--RelatedTo--> Iron <--RelatedTo--> Blood <--RelatedTo--> Donor 
Bottle --IsA--> Vessel <--RelatedTo--> Glass <--RelatedTo--> Invisible 