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  1. /* 
  2.  * here is the second one -- function turned into an operator
  3.  * and optimization possible
  4.  */
  5.  
  6. retrieve (c1.name, c2.name)
  7. from c1 in city, c2 in city
  8. where c1.location && c2.location
  9. \p
  10.