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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
3.4.11.8 created 1972, deleted 1981
3.4.11.11 created 1978, deleted 1992
3.4.11.12 created 1978, deleted 1997