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EC Tree
1.1.99.15 created 1978, deleted 1980
1.1.99.17 created 1982, deleted 2003
1.13.11.7 created 1965 as EC 1.13.1.7, transferred 1972 to EC 1.13.11.7, deleted 1980
1.13.11.21 created 1972, deleted 2001