8 people want to cross a river via boat only. They are mother , father, policeman, criminal, 2 daughters, 2 sons.
The boat can be driven by Police, mother or father only.
The boat carries only 2 people at a time.
The criminal if left without police can hurt someone but wont run away if he is alone.
The daughters left without mother would be hurt by the father.
The sons left without Father would be hurt by the mother.
If one a riverside mother is absent and father arrives by boat, he can still hurt the daughters and vice versa.
Find a way to take them all to the other side safely, without hurting anyone.
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