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Organization of partitioned 4-way tree entry points. Nodes at levels 10 and 11 within a 4-way tree data structure are collected and placed into labelled bins. There are a total of 16 bins as there are a total of 16 possible dinucleotide combinations. The label for each bin is the nucleotide at level 10 followed by the nucleotide at level 11. The bins hold entry points into the tree data structure. Entry nodes within a bin are used to partition the 4-way tree.
