| 摘要 |
Display and/or input regions to represent a plurality of tree-related elements include a region to represent a root element, at least two concave regions to represent at least two non-root, internal elements, and at least two regions to represent at least two leaf elements. In a particular embodiment, a first concave region is radially adjacent both a second concave region and a third concave region, the second concave region is angularly adjacent the third concave region, and a radial width of the second concave region differs from a radial width of the third concave region.
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