int function ( ) { return min_group_len ; }
get the minimum group length . concode_field_sep int MIN_ALLOWED concode_elem_sep int MAX_ALLOWED concode_elem_sep int min_group_len concode_elem_sep int max_group_len concode_elem_sep int pref_group_len concode_field_sep int getPref_group_len concode_elem_sep int getMax_group_len