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EC Tree
1.97.1.5 created 2000 deleted 2001
1.97.1.6 created 2000 deleted 2001
1.97.1.7 created 2000, deleted 2001
3.4.11.8 created 1972, deleted 1981
3.4.11.11 created 1978, deleted 1992
3.4.11.12 created 1978, deleted 1997