Problem
solvers wanted!

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x > 523688865268425016
x < 732502104004147816
x ≡ 13135 (mod 249853)
x ≡ 447151 (mod 598363)
x ≡ 539404 (mod 698359)

let i = x.startIndex
let j = x.index(i, offsetBy:9)
let k = x.index(j, offsetBy:9)
let phone1 = "+34"+x.substring(with:i..<j)
let phone2 = "+34"+x.substring(with:j..<k)
let email = x+"@nomasystems.com"

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