Severity degree Name 9N C2a 13 14 C2b 22 23 C3a 14 6 20 C3b 21 26 C10 19 20 C16 19 25 C18 17 21 C19 17 20 NBBTF1 27 38 NBBT2 18 20 NBBT3 11 20 BS11 15 20 BS14 9 14 BS15 15 20 BL8 10 23 IW I N W O P O O O N O U B B N P O P O O O N O P P P O O OPP FL1 7 19 N HIN NOP POO POO OWN K NW P PO W E N O O O O KO O O UM FL2 14 17 FL3 14 26 FL4 19 31 FL6 11 14 FL7 10 20 FS1 15 27 FS2 8 19 FS3 15 17 FS4 13 17 FS5 13 19 FBTL-1 12 21 FBTL-2 15 23 FBTL-3 19 29 FBTL-4 14 26 FBTL-5 10 14 FBTL-6 14 17 FBTL-7 10 21