suggest the punishment

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recently i have come across a news in which i saw two men used to kidnap the poor girls of less than 10 years, whom they used to rape again and again and than they would kill them would bury them in their backyard. by mistake they kidnapped two young boys and as they were scared of leaving them, they killed them too..till now more than 30 skeletons of the children are found. one man is a very rich businessman and the other one is his servant. i am so furious that i want to put big cuts all over their body with knife. what do you think should be the punishment for these beasts..i am really shattered as these is the most henious crime i have ever come across.