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At: trans functionality wrt iff

  T:Type, R,R':(TTProp).
  (x,y:TR(x,y R'(x,y))
  
  ((Trans y,x:TR(x,y))  (Trans y,x:TR'(x,y)))


By: UnivCD THEN Unfold `trans` 0


Generated subgoal:

1 1. T : Type
2. R : TTProp
3. R' : TTProp
4. x,y:TR(x,y R'(x,y)
  (a,b,c:TR(b,a R(c,b R(c,a))
  
  (a,b,c:TR'(b,a R'(c,b R'(c,a))

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