# This book is not valid in AUT-QE because [y:'type'] is not allowed
# This book is not valid in \lambda\delta < 3 because sort inclusion is not allowed
# This book is not valid in \lambda\delta 3 because of two \upsilon-reductions on layer 1

+l
@ Delta := [x:[y:'type']'type']<x>x : [x:[y:'type']'type']'type'
@ Omega := <Delta>Delta : 'type'
-l