-ol bbb bbf bbi bbl bbo bbs bbt bfb bff bfi bfl bfo bfs bft bi- bib bif bii bil bio bis bit blb blf bli bll blo bls blt bob bof boi bol boo bos bot bsb bsf bsi bsl bso bss bst btb btf bti btl bto bts btt fbb fbf fbi fbl fbo fbs fbt fff ffi ffl ffo ffs fft fib fif fii fil fis fit flb flf fli fll flo fls flt fob fof foi fol foo fos fot fsb fsf fsi fsl fso fss fst ftb ftf fti ftl fto fts ftt i-f ibb ibf ibi ibl ibo ibs ibt ifb iff ifi ifl ifo ifs ift iib iif iii iil iio iis iit il- ilb ilf ili ill ilo ils ilt io- iob iof ioi iol ioo ios iot is- isb isf isi isl iso iss ist itb itf iti itl ito its itt lbb lbf lbi lbl lbo lbs lbt lfb lff lfi lfl lfo lfs lft lib lif lii lil lio lis lit llb llf lli lll llo lls llt lob lof loi lol loo los lot lsb lsf lsi lsl lso lss lst ltb ltf lti ltl lto lts ltt o-i ob- obb obf obi obl obo obs obt of- ofb off ofi ofl ofo ofs oft oib oif oii oil oio ois oit olb olf oli oll olo ols olt oo- oob oof ooi ool ooo oos oot os- osb osf osi osl oso oss ost ot- otb otf oti otl oto ots ott sbb sbf sbi sbl sbo sbs sbt sfb sff sfi sfl sfo sfs sft sib sif sii sil sio sis sit slb slf sli sll slo sls slt sob sof soi sol soo sos sot ss- ssb ssf ssi ssl sso sss sst stb stf sti stl sto sts stt tbb tbf tbi tbl tbo tbs tbt tfb tff tfi tfl tfo tfs tft tib tif tii til tio tis tit tlf tli tll tlo tls tlt to- tob tof toi tol too tos tot tsb tsf tsi tsl tso tss tst ttb ttf tti ttl tto tts ttt