The following is based in part on https://www.haskell.org/tutorial/, other Haskell web resources, and the 2014 book Thinking Functionally in Haskell by Richard Bird ...
To evaluate a postfix expression, you need a stream of tokens and a stack that holds tokens. For example, to evaluate 2 3 +, you read in the tokens one at a time, from left to right, and apply the ...
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