The main message of the story " The Outcasts of Poker Flat" would basically be : punishment without justice is as bad as the crime.
Hope this helps. (:
"calls" would be the right tense to use in this question
Answer:
In order to learn the work.
Explanation:
After the computers had been installed by the service reps a training session was held for us by them in order to learn the work. This training session is very necessary for the right use of these computers for the official work. The training session was held under the supervision of highly qualified and experienced persons which make this session very useful for us.