-ol bbb bbl bbn bbo bbr bbs bbt blb bll bln blo blr bls blt bnb bnl bnn bno bnr bns bnt bob bol bon boo bor bos bot brb brl brn bro brr brs brt bsb bsl bsn bso bsr bss bst btb btl btn bto btr bts btt lbb lbl lbo lbr lbs lbt llb lll lln llo llr lls llt lnb lnl lnn lno lnr lns lnt lob lol lon loo lor los lot lrb lrn lro lrr lrs lrt lsb lsl lsn lso lsr lss lst ltb ltl lto ltr lts ltt nbb nbl nbn nbo nbr nbs nbt nlb nll nln nlo nlr nls nlt nnb nnl nnn nno nns nnt no- nob nol non noo nor nos not nrb nrl nrn nro nrr nrs nrt nsb nsl nsn nso nsr nss nst ntb ntn nto ntr nts ntt ob- obb obl obn obo obr obs obt olb oll oln olo ols olt on- onb onl onn ono onr ons ont oo- oob ool oon ooo oor oos oot or- orb orl orn oro orr ors ort os- osb osl osn oso osr oss ost ot- otb otl otn oto otr ots ott rbb rbl rbn rbo rbr rbs rbt rll rln rlo rlr rls rlt rnb rnn rno rnr rns rnt rob rol ron roo ror ros rot rrb rrl rrn rrr rrs rrt rsb rsl rsn rso rsr rss rst rtb rtl rtn rto rtr rts rtt sbb sbl sbn sbo sbr sbs sbt slb sll sln slo slr sls slt snb snl snn sno snr sns snt sob sol son soo sor sos sot sr- srb srl srn sro srr srs srt ss- ssb ssl ssn sso ssr sss sst stb stl stn sto str sts stt tbb tbl tbn tbo tbr tbs tbt tll tln tlo tlr tls tlt tnb tnl tnn tno tnr tns tnt to- tob tol ton too tor tos tot trb trl trn tro trr trs trt tsb tsl tsn tso tsr tss tst ttb ttl ttn tto ttr tts ttt