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Stuck on last two in bottom right;

51a Is regret possible outcome if you do this on computer (5,8) _ _ I _ T REGISTER

47d Maniac sacrificed, holding up envious assassin (5) C _ _ _ A is it something to do woth Cain?
Thanks

shift register?

CASCA (hidden upwards - one the conspirators against Julius Caesar)

Thanks, glad to get it finished before tomorrow's!