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characteroperations The basic Konilo system provides a small number of words for working with characters. To push a character to the stack, use the `$` sigil. E.g., `$P` would push the ASCII code for "P". You can check the case of a character with +c:uppercase? or +c:lowercase? . Changing the case is done with +c:to-upper and +c:to-lower . Reading characters is done with `c:get`, and display of them uses `c:put`. And finally there is `c:t-s`, which returns a string with a single character.