Parsing and Grammars

LR(1) but not LL(n) for any n

Jerry Leichter gave a nice example of such a language

{x²ⁿy²ⁿe, x²ⁿ⁺¹y²ⁿ⁺¹o}

with grammar:

S : E e
  | O o
  ;
E :
  | x O y 
  ;
O : x E y
  ;