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EC Tree
1.2.3.2 created 1961, deleted 1984
1.2.3.10 created 1990, deleted 2003
1.2.3.12 created 2000, deleted 2003
1.4.4.1 created 1972, modified 1982 (EC 1.4.1.6 created 1961, incorporated 1982), deleted 2003