Easy feed them to pigs, ground the body into chum and stave some pigs. They will eat the bones and all. So unless someone checks the pigs shit within a few days they won't be able to tell. Well that's now the kray twins did it
That's very unpractical because it's very to burn everything and it smells too much. For example average temperature in crematorium is 1000°C or 1800°C.
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