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This paper introduces a new descriptive model for indirect text composition facilities that is based on the notion of a containment hierarchy. This paper also demonstrates a novel, computer-aided technique for the design of indirect text selection interfaces -one in which Huffman coding is used for the derivation of the containment hierarchy. This approach guarantees the derivation of optimal containment hierarchies, insofar as mean encoding length. This paper describes an empirical study ofdoi:10.1145/1168987.1168992 dblp:conf/assets/BaljkoT06 fatcat:jg2y4fc7cbd5xniokbyi5gelay