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EC Tree
1.6.2.1 created 1961, deleted 1965
1.6.2.3 created 1972, deleted 1965
5.3.1.2 created 1961, deleted 1976
5.3.1.10 created 1961, deleted 2000
5.3.1.11 created 1961, deleted 1978
5.3.1.18 created 1972, deleted 1978
5.3.1.19 created 1972, deleted 1984