Удиви меня

F x z

F x zF x zF x zF x zF x zF x z
F x zF x zF x zF x zF x zF x z
F x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x zF x z