Tap is related to Use. Use is related to Buy. Buy is related to Operation. 
Proportion is related to Size. Size is related to Weight. Weight is related to Person. Person does not want (to) Uncomfortable. 
Tap <--RelatedTo--> Use <--RelatedTo--> Buy <--RelatedTo--> Operation 
Proportion <--RelatedTo--> Size <--RelatedTo--> Weight <--RelatedTo--> Person --NotDesires--> Uncomfortable 