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Jan 24th, 2019
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  1. checkIfBST(t(_, nil, nil)).
  2.  
  3. checkIfBST(t(Key, t(LKey, LLT, LRT), nil)):-
  4.     Key > LKey,
  5.     checkIfBST(t(LKey, LLT, LRT)).
  6.  
  7. checkIfBST(t(Key, t(RKey, RLT, RRT))):-
  8.     Key > RKey,
  9.     checkIfBST(t(RKey, RLT, RRT)).
  10.  
  11. checkIfBST(t(Key, t(LKey, LLT, LRT), t(RKey, RLT, RRT))):-
  12.     Key > LKey,
  13.     Key < RKey,
  14.     checkIfBST(t(LKey, LLT, LRT)),
  15.     checkIfBST(t(RKey, RLT, RRT)).
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