5mod(mod(2,3mod(2.1)))=0.2
fact(100)=93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000
5*6+81/23mod 74*2^8=931.565
sum((([1,2,3,4,5,6,7]))) =28
1---5=-4
-sin(-+2)=0.909297
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