Ready is related to Wear. Wear is a synonym of Tire. Tire is related to Cake. 
Let is related to Lack. Lack is a synonym of Want. Want is a different concept from Quantity. Quantity is related to Bulk. 
Ready <--RelatedTo--> Wear <--Synonym--> Tire <--RelatedTo--> Cake 
Let <--RelatedTo--> Lack <--Synonym--> Want <--DistinctFrom--> Quantity <--RelatedTo--> Bulk 