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EC Tree
1.4.3.9 created 1972, deleted 1984
1.4.3.17 created 2000, deleted 2003
1.4.3.18 proposed 2000
1.6.7.1 created 1972, deleted 1978
1.6.7.2 created 1972, deleted 1978
1.6.7.3 created 1978, deleted 1978