There has been some suspicious activity from IP addresses that start with $"68\mathrm{.}99".$ In the file "last$\_$log$"$ they are listed as $"68\mathrm{.}99."$ or $"68-99-"$ or $"$ip$68-99-"$ and they may have $".$om$"$ or $".$o$"$

on the end. $($These are Cox users in Omaha. For the correct answer you will need to figure out how to eliminate the extra junk and just use the IP address.$)$ Provide one command that gives a sorted list of these suspicious users in the following format:

adammuno $68\mathrm{.}99\mathrm{.}4\mathrm{.}45$

ajgehrin $68\mathrm{.}99\mathrm{.}5\mathrm{.}15$

$($snip $-28$ records not shown$)$

wmahoney $68\mathrm{.}99\mathrm{.}3\mathrm{.}88$

zfaulkne $68\mathrm{.}99\mathrm{.}28\mathrm{.}102$

You may need to use the combination of "grep", "sed" $($with multiple $-$e options$),$ "awk", "sort", and "uniq". The correct output should have $32$ rows that match. Check that the usernames are not being mangled by your commands. So for example the wmahoney user should have all its letters and be outputted as wmahoney.

Hint: find out all the lines with that IP pattern, eliminate the possible $"$ip$",$ eliminate the possible $".$om$"$ or $".$o$",$ find out the first and third fields, lastly sort and uniq.