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diff --git a/matita/tests/interactive/drop.ma b/matita/tests/interactive/drop.ma
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+
+
+alias id "O" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1/1)".
+alias num (instance 0) = "natural number".
+alias symbol "eq" (instance 0) = "leibnitz's equality".
+alias symbol "plus" (instance 0) = "natural plus".
+theorem a : O + 1 = 1.
+drop.