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Feb 6th, 2016
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  1. 2 focused subgoals (unfocused: 0-0-1)
  2. , subgoal 1 (ID 921)
  3.  
  4. A : Type
  5. B : Type
  6. f : A -> B
  7. x' : A
  8. l' : list A
  9. y : B
  10. IHl' : In y (map f l') -> exists x : A, f x = y /\ In x l'
  11. H2 : exists x : A, f x = y /\ In x l'
  12. ============================
  13. f x' = y
  14.  
  15. subgoal 2 (ID 919) is:
  16. In x' (x' :: l')
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