+/** More reliable version of the form. The former assumes that e is an
+ * expanded epxression. */
+exvector get_all_dummy_indices_safely(const ex & e);
+
+/** Returns b with all dummy indices, which are listed in va, renamed
+ * if modify_va is set to TRUE all dummy indices of b will be appended to va */
+ex rename_dummy_indices_uniquely(exvector & va, const ex & b, bool modify_va = false);
+