If the same user is both in read and write permissions, keep only the entry in write.
[pithos] / pithos / api /
drwxr-xr-x   ..
-rwxr-xr-x 0 __init__.py
-rw-r--r-- 3620 compat.py
-rw-r--r-- 2358 faults.py
-rw-r--r-- 43846 functions.py
-rw-r--r-- 57 models.py
drwxr-xr-x - templates
-rw-r--r-- 1913 urls.py
-rw-r--r-- 29411 util.py
-rwxr-xr-x 26 views.py