Write a function that evaluates an expression in RPN that is given as a string.
To evaluate an expression in Reverse Polish Notation (RPN), we can use a stack data structure. In RPN, the operators follow their operands, and no parentheses are needed. The evaluation proceeds by reading __________ ____ _______ ____ ________ _____ ______ ________.
__________ ___ ________ ________ __________ __________ __________ _____ ________ ________ ___.
_________ __________ __________ ______ ____ ________ _____ _______ ___ ________ __________ ____.
_____ ____ _______ __________ ____ _________ _____.
______ ______ ___ _______ _________ __________ _______ ______ ________ _____.
____ __________ __________ _____ ___ ____ ______ _____ _______ _____ _______ _____.
___ _______ ____ _____ ____ ________ _________ __________.
__________ _____ ________ _____ ___ ______ ___ ________.
_______ ________ ______ ______ __________ _____ ________ _______ _________.
________ ________ ________ ____ ________ _________ __________ _____ ________ __________ _________ ____.
______ ______ _______ _______ ___.
________ _____ _________ _____ __________ _______ ________ _______.
_______ _________ _________ ___ _____ _____ ______.
________ __________ __________ _________ ___ ___ ____ __________ ________ ___.
________ ____ _______ ___ _____ __________ ____ _________ _____ _____.
______ _____ ____ ________ _____ __________ ______ _______.
____ ____ _______ __________ ____.
__________ ____ _________ ____ ____.
___ _______ ________ _______ _______.
_________ _________ _______ _______ _____ _______.
_____.
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