In Europe, the lettering was similar, except that "A" was used if the group was before group 10, and "B" was used for groups including and after group 10.
Di Eropa, penggunaan abjad juga sama, kecuali: "A" digunakan jika golongan berada sebelum golongan 10, dan "B" digunakan untuk golongan 10 dan seterusnya.