4 Read
2 Write
1 Execute

ie 5 = R+X (4+1)
   6 = R+W (4+2)
   7 = R+W+X (4+2+1)

  7     5     5
owner group everyone-else

##</code><code>##

Sorry the system is currently unable to fulfil you request due to:

1) Routine Maintenance
2) Unusually high load
3) Transient network hiccups and miscalaneous flatulence
4) Being on strike cause of the 
      24/7 working hours, 
      low pay and 
      total lack of appreciation from my programmers.
.....