Currently, if you're stuck, the game only offers to reveal the entire puzzle, forcing you to move onto the next difficulty level and start over. However, we have you covered! Below are piecemeal answers that will serve as hints so that you can find your way through each difficulty level.
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More recently, there are a new wave of command-line libraries like the Python Prompt Toolkit, the Fish Shell and the Ammonite Scala REPL (My own project) that provide a richer command-line experience than traditional Readline/JLine based command-lines, with features like syntax-highlighted input and multi-line editing: