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The claimed {Q,S}=0 is in fact nonzero. See e.g. (2.9) in https://arxiv.org/pdf/hep-th/9905111.pdf — Preceding unsigned comment added by SJVT (talk • contribs) 10:09, 26 April 2019 (UTC)
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The list of commutators is missing [P,S] and [K,Q] which are non-trivial. — Preceding unsigned comment added by 129.199.158.43 (talk) 13:15, 20 November 2012 (UTC)