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f n=[k|k<-[1..n]],and[mod(m^k)n<2|m<-[1..n],gcd m n<2]]!!0
f n=[k|k<-[1..n],and[mod(m^k)n<2|m<-[1..n],gcd m n<2]]!!0
f n=[k|k<-[1..],and[mod(m^k)n<2|m<-[1..n],gcd m n<2]]!!0
