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EC Tree
2.1.1.23 created 1972, modified 1976, modified 1983, deleted 1999
2.1.1.24 created 1972, modified 1983, modified 1989, deleted 1992
2.1.1.30 created 1972, deleted 1981
2.1.1.58 created 1981, deleted 1984
2.1.1.73 created 1984, deleted 2003
2.1.1.81 created 1989, deleted 1990
2.1.1.134 created 1999, deleted 2002
2.1.1.135 created 1999, deleted 2003
2.1.1.138 created 2000, deleted 2003