Machine can be used for Stretch. Machine is related to Technology. 
Parental is related to Father. Father is related to Woman. Woman is a type of Human. Human is related to Ear. 
Stretch <--UsedFor-- Machine <--RelatedTo--> Technology 
Parental <--RelatedTo--> Father <--RelatedTo--> Woman --IsA--> Human <--RelatedTo--> Ear 