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This is how it all began: a math copybook signed Russell Goodcoin, with all kinds of weird drawings inside. The ordinary ball-point pens (mostly black, but sometimes also green, red and blue) were used as the media.
As for the pen-name, "Goodcoin" is a rough translation of the last name Kaishauri, which means (or rather sounds like) a "good five-copeck coin" in Georgian.
