+alias id "or_intror" = "cic:/Coq/Init/Logic/or.ind#xpointer(1/1/2)".
+alias id "pr0_subst0_fwd" = "cic:/matita/LAMBDA-TYPES/Level-1/LambdaDelta/pr0/props/pr0_subst0_fwd.con".
+alias id "ex2_sym" = "cic:/matita/LAMBDA-TYPES/Level-1/Base/types/props/ex2_sym.con".