-ol ddd ddf ddl ddo ddt dfd dff dfl dfo dft dl- dld dlf dll dlo dlt dod dof dol doo dot dtd dtf dtl dto dtt fdd fdf fdl fdo fdt ffd fff ffl ffo fft fld flf fll flo flt fof fol foo fot ftd ftf ftl fto ftt ldd ldf ldl ldo ldt lfd lff lfl lfo lft lld llf lll llo llt lod lof lol loo lot ltd ltf ltl lto ltt odd odf odl odo odt of- ofd off ofl ofo oft old olf oll olo olt oo- ood oof ool ooo oot ot- otd otf otl oto ott tdd tdf tdl tdo tdt tfd tff tfl tfo tft tld tlf tll tlo tlt to- tod tof tol too tot ttd ttf ttl tto ttt