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We present a new system, called Cirrin, for pen input of ASCII characters using word-level unistrokes. Our system addresses the tradeoff between speed and accuracy of penbased text entry by substituting precision on the part of the user for ease of recognition on the part of the computer. Cirrin supports ease of recognition by the computer combined with natural, script-like input. This paper discusses the design space of word-level, unistroke input, focusing on the choices made in the circular model of Cirrin that is currently in daily use by the first author.