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EC Tree
1.4.4.1 created 1972, modified 1982 (EC 1.4.1.6 created 1961, incorporated 1982), deleted 2003
2.3.1.55 created 1976, deleted 1999
2.3.1.120 created 1990, deleted 1992
2.3.1.124 created 1990, deleted 1992