Ledger89
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Stored values

    Keyboard
    Enter
    Work out the line
    ↑ ↓
    Recall past entries
    Esc
    Clear the line
    ← →
    Move along the line; the hint under it follows the function you are in
    + - * / ^
    At the start of a line, keep working on the last answer
    ->
    Store, same as →