-/**
- * Open a file whose name is composed from the graph's name and the current register class.
- * @note The name of the file will be prefix(ifg_name)_(reg_class_name).suffix
- * @param prefix The file name's prefix.
- * @param suffix The file name's ending (the . is inserted automatically).
- * @return A text file opened for writing.
- */
-FILE *be_chordal_open(const be_chordal_env_t *env, const char *prefix, const char *suffix);
-