-ol fff ffl ffm ffo fft flf fll flm flo flt fmf fml fmm fmo fmt fof fol fom foo fot ftf ftl ftm fto ftt lff lfl lfm lfo lft llf lll llm llo llt lmf lml lmm lmo lmt lof lol lom loo lot ltf ltl ltm lto ltt m-f m-o mff mfl mfm mfo mft mlf mll mlm mlo mlt mmf mml mmm mmo mmt mof mol mom moo mot mtf mtl mtm mto mtt of- off ofl ofm ofo oft olf oll olm olo olt om- omf oml omm omo omt oo- oof ool oom ooo oot ot- otf otl otm oto ott tff tfl tfm tfo tft tlf tll tlm tlo tlt tmf tml tmm tmo tmt to- tof tol tom too tot ttf ttl ttm tto ttt