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Purpose: For explaning the meaning of both 2 symbols

1) For the first symbol '→', it  is mathematically speaking an implication operator. 

Statement A →  Statement B means  (A/B could be a statement like (Posting DATE < current date)

-          IF A is true and B is true then the result is true

-          IF A is false and B is false then the result is true

-          IF A is true and B is false then the result is false

-          IF A is false and B is true then the result is true

2) For the second symbol '↔', it is mathematically speaking an equivalence 

-          IF A is true and B is true then the result is true

-          IF A is false and B is false then the result is true

-          IF A is true and B is false then the result is false

-          IF A is false and B is true then the result is false

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