Study the users, their groups, and the access permissions for the users and groups in the following (imaginary) output of the ls command of some directory on a Linux system. Assume that we wish to depict the information in the form of access control lists based on user ids and group ids: that is, what each user can do and what each group can do (see the last 9 lines on Page 607 of Tanenbaum) .

Present the access permissions presented below using access control lists of the above kind. The permissions given in your answer must be equivalent to the permissions given below.

-rw-r--rw- 1 abc faculty 10 2017-04-16 f1

-rw-r-xr-- 1 def students 20 2017-04-16 f2

-rwxr-xrwx 1 def students 20 2017-04-16 f3

-rwxr-xr-x 1 ghi students 15 2017-04-16 f4

-r--r-x--- 1 abc faculty 20 2017-04-16 f5

-rw-r--r-x 1 bcd faculty 30 2017-04-16 f6