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sigma expr with i in a..b     where i:Identifier,a:ZZ,b:ZZ,expr:Expression









sigma expr with i1,…,inin r1,…,rn     where ij:Identifier,rj:List | Vector | Range,expr:Expression









sigma expr with i1,…,inin r1,…,rnwhere p     where ij:Identifier,rj:List | Vector | Range,expr:Expression,expr:Expression





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