numbers => [zero, un, dos, tres, quatre, cinc, sis, set, vuit, nou,
    deu, onze, dotze, tretze, catorze, quinze, setze, disset, divuit, dinou,
    20 => vint, 30 => trenta, 40 => quaranta, 50 => cinquanta,
    60 => seixanta, 70 => setanta, 80 => vuitanta, 90 => noranta,
    100 => cent
]
rules => [
    21-29 => vint-i-{digit},
    31-99 => {ten}-{digit},
    200,300,400,500,600,700,800,900 => {digit}-cents
]
exponents => [mil, milió, mil milions, bilió]
separator => ' '