For all of you who do not understand the norwegian justice system he has effectively life time sentence without the possibility of parole. Much thanks to himself. He has 21 years with STORAGE. Storage means that every 5 years the judges checks whether he poses a danger to to society and the judge said Norway will continue to be a multi cultural society. Knowing this and reading the sentence (90 pages) gives a lot to future judges to make sure he will never leave the prison.
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from the article: Norwegian mass murderer Breivik sentenced to 21 years