Get the global basic level spreadsheets
get_global_bl_mappings.RdThey are used to map every token in all_basiclevel_na to its global basic
level, see map_global_basic_level and update_global_basic_levels
get_global_bl_mappings.RdThey are used to map every token in all_basiclevel_na to its global basic
level, see map_global_basic_level and update_global_basic_levels