Grape is related to Black. Black is related to Disease. Disease is related to Reaction. 
Nail is related to Habit. Habit is related to Drinking. Drinking is related to Eat. Eat is related to Present. 
Grape <--RelatedTo--> Black <--RelatedTo--> Disease <--RelatedTo--> Reaction 
Nail <--RelatedTo--> Habit <--RelatedTo--> Drinking <--RelatedTo--> Eat <--RelatedTo--> Present 