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EC Tree
1.18.2.1 created 1978, deleted 1984
1.99.2.1 created 1961, deleted 1965
1.99.2.2 created 1961, deleted 1965
1.99.2.3 created 1961, deleted 1965
1.99.2.4 created 1961, deleted 1965
1.99.2.5 created 1961, deleted 1965
1.99.2.6 created 1961, deleted 1965