b f fab feb fib fob fsb fbi ab bb db eb gb hb
kb lb mb nb ob pb rb sb tb wb yb zb fa fe fl fm fo
fr ft
b F Fib Fob Fub Ab- Ob- Sb Fa Fe Fo Fu
-fy
Ob- FM
b bf FCB FSB A&B bb cb DB GB KB lb MB NB
Ob- sb VB FC FF fi fj fk F+L FM fo FP fr FS FT fx