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EC Tree
1.2.4.3 created 1972, deleted 1978
1.12.99.1 created 1989, deleted 2002
1.12.99.2 created 1992, deleted 2002
1.12.99.3 created 1999, deleted 2002
1.12.99.4 created 1999, deleted 2002
1.12.99.5 created 1999, deleted 2001