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EC Tree
1.3.1.23 created 1972, deleted 2005
1.3.1.50 created 1992, deleted 1999
1.3.1.55 created 1999, deleted 2004
1.4.3.9 created 1972, deleted 1984
1.4.3.17 created 2000, deleted 2003
1.4.3.18 proposed 2000