sort entries in each row by ascending column index in case the column indices have been permuted. this happens in-place with bubble sort, so there is surely room for improvement
sort entries in each row by ascending column index in case the column indices have been permuted. this happens in-place with bubble sort, so there is surely room for improvement

RRZE-HPC/GHOST,RRZE-HPC/GHOST,RRZE-HPC/GHOST,RRZE-HPC/GHOST