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At: order functionality wrt iff

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


By: RepD THEN Unfold `order` 0


Generated subgoal:

1 1. T : Type
2. R : TTProp
3. R' : TTProp
4. x,y:TR(x,y R'(x,y)
  Refl(T;x,y.R(x,y)) & (Trans x,y:TR(x,y)) & AntiSym(T;x,y.R(x,y))
  
  Refl(T;x,y.R'(x,y)) & (Trans x,y:TR'(x,y)) & AntiSym(T;x,y.R'(x,y))

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