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H🌍++ runs on a string stack (initially empty).
|f||Read a string and pushes it into stack.|
|u||Pop the stack and output (does nothing if the stack is empty).|
|c||Empty the stack if the stack isn't empty and the top of stack is |
|k||Loop until the stack is empty.|
|!||End of loop, matches a |
Non-command characters push themselves as a string into the stack.
A more elaborate one:
Cat Program (non-terminating)
H🌍++ is of course a push-down automaton.