func cardinal(n) {
    static lingua_en = frequire("Lingua::EN::Numbers")
    lingua_en.num2en(n) - / and|,/g
}

func four_is_magic(n) {
    var str = ""
    loop {
       str += (cardinal(n) + " is ")
       if (n == 4) {
           str += "magic."
           break
       } else {
           n = cardinal(n).len
           str += (cardinal(n) + ", ")
       }
   }
   str.tc
}

[0, 4, 6, 11, 13, 75, 337, -164, 9_876_543_209].each { |n|
    say four_is_magic(n)
}