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N sit in Car 3. A sit in Car 2 car not with O. B and E sit in same car. B does not sit in Car 1. C and T sit in same car but neither with A nor with N. It means B and E sits either in Car 2 or Car 3. S and T sit in Car 1.
W, P and O sit in same car. W, P and O cannot sit in Car 1 as not more than four people sit in same car. W, P and O cannot sit in Car 2 as A sit in car 2 not with O. So, case 2 will get discarded.
Final arrangement as shown below: