http://www.mediafire.com/file/06ly2kyxgb2gxy6/3_grutos_10_last_digit.xlsx/file
In the example, the suit was chosen as the group A = 4 group B = 1 and group c = 2
Last digit = group A = 0,3,5,7,9 group B lastdigit = 4.7 group clast digit = 3,6,8
If you choose the suit and the last last digit