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Reverse Polish Notation is a mathematical notation where every operator follows all of its operands. For instance, to add three and four, one would write "3 4 " rather than "3 4". If there are multiple operations, the operator is given immediately after second operand."3 4-5"--> "3 4 5-": https://www.reddit.com/r/Python/comments/9ffkem/reverse_polish_notation_is_a_mathematical/