Reminded me of milk and milk. When the son was 7-8 years old, they played a game with him, combining two random objects on a common trait. According to the rules, the character could be any, starting with the same number of letters in the names and ending with a joke similarity. We quickly abandoned this game because it was too easy for the child to combine any two objects. Much easier than an adult. For example, what is the common between a tractor and a blanket? "And the same people did". So, why am I, do you know what’s in common between the sky and the border? "You can’t eat it at all!"