*       # Arabic to Roman
        define('roman(n)s,ch,val,str') :(roman_end)
roman   roman = ge(n,4000) n :s(return)
        s = 'M1000 CM900 D500 CD400 C100 XC90 L50 XL40 X10 IX9 V5 IV4 I1 '
rom1    s span(&ucase) . ch break(' ') . val span(' ') = :f(rom2)
        str = str dupl(ch,(n / val))
        n = remdr(n,val) :(rom1)
rom2    roman = str :(return)
roman_end

*       # Roman to Arabic
        define('arabic(n)s,ch,val,sum,x') :(arabic_end)
arabic  s = 'M1000 D500 C100 L50 X10 V5 I1 '
        n = reverse(n)
arab1   n len(1) . ch = :f(arab2)
        s ch break(' ') . val
        val = lt(val,x) (-1 * val)
        sum = sum + val; x = val :(arab1)
arab2   arabic = sum :(return)
arabic_end

*       # Test and display
        tstr = '2010 1999 1492 1066 476 '
tloop   tstr break(' ') . year span(' ') = :f(out)
        r = roman(year)
        rstr = rstr year '=' r ' '
        astr = astr r '=' arabic(r) ' ' :(tloop)
out     output = rstr; output = astr
end