-ol bbb bbe bbi bbl bbo bbs bbt be- beb bee bei bel beo bes bet bi- bib bie bii bil bio bis bit blb ble bli bll blo bls blt bob boe boi bol boo bos bot bsb bse bsi bsl bso bss bst btb bte bti btl bto bts btt ebb ebe ebi ebl ebo ebs ebt eeb eee eel eeo ees eet eib eie eii eil eio eis eit elb ele eli ell elo els elt eo- eob eoe eoi eol eoo eos eot es- esb ese esi esl eso ess est etb ete eti etl eto ets ett ibb ibe ibi ibl ibo ibs ibt ie- iee iei iel ies iet iib iie iii iil iio iis iit il- ilb ile ili ill ilo ils ilt io- iob ioe ioi iol ioo ios iot is- isb ise isi isl iso iss ist itb ite iti itl ito its itt lbb lbe lbi lbl lbo lbs lbt leb lee lei lel leo les let lib lie lii lil lio lis lit llb lle lli lll llo lls llt lob loe loi lol loo los lot lsb lse lsi lsl lso lss lst ltb lte lti ltl lto lts ltt o-i ob- obb obe obi obl obo obs obt oeb oee oei oel oeo oes oet oib oie oii oil oio ois oit olb ole oli oll olo ols olt oo- oob ooi ool ooo oos oot os- osb ose osi osl oso oss ost ot- otb ote oti otl oto ots ott sbb sbe sbi sbl sbo sbs sbt se- seb see sei sel seo ses set sib sie sii sil sio sis sit slb sle sli sll slo sls slt sob soe soi sol soo sos sot ss- ssb sse ssi ssl sso sss sst stb ste sti stl sto sts stt tbb tbe tbi tbl tbo tbs tbt te- teb tee tei tel teo tes tet tib tie tii til tio tis tit tle tli tll tlo tls tlt to- tob toe toi tol too tos tot tsb tse tsi tsl tso tss tst ttb tte tti ttl tto tts ttt