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EC Tree
1.6.7.1 created 1972, deleted 1978
1.6.7.2 created 1972, deleted 1978
1.6.7.3 created 1978, deleted 1978
3.1.3.30 created 1972, deleted 1992
3.1.3.61 created 1992, deleted 2002
3.1.3.65 created 1992, deleted 2002