City is related to Hall. Hall is related to Walking. Walking is related to Door. Door is related to Closer. 
Try is related to Fly. Machine can be used for Fly. Machine is related to Vacuum. Vacuum is related to Carpet. 
City <--RelatedTo--> Hall <--RelatedTo--> Walking <--RelatedTo--> Door <--RelatedTo--> Closer 
Try <--RelatedTo--> Fly <--UsedFor-- Machine <--RelatedTo--> Vacuum <--RelatedTo--> Carpet 