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include "delayed_updating/substitution/fsubst.ma".
-include "delayed_updating/substitution/lift_prototerm.ma".
+include "delayed_updating/substitution/lift_prototerm_eq.ma".
include "delayed_updating/substitution/lift_structure.ma".
include "delayed_updating/syntax/preterm.ma".
include "delayed_updating/syntax/prototerm_proper.ma".