The numbers go 1 2 3 4 5 6 7 8 9 A-Abb B-Bib C-Cleven D-Dib 10-Firn 11-Firn-One 12-Firn-Two 13-Firn-Three 14-Firn-Four 15-Firn-Five 16-Firn-Six 17-Firn-Seven 18-Firn-Eight 19-Firn-Nine 1A-Firn-Abb 1B-Firn-Bib 1C-Firn-Cleven 1D-Firn-Dib 20-Two Firn
