-ic -ol bbb bbc bbi bbk bbl bbo bbs bbt bcb bcc bci bck bcl bco bcs bct bi- bib bic bii bik bil bio bis bit bkb bkc bkk bkl bko bks bkt blb blc bli blk bll blo bls blt bob boc boi bok bol boo bos bot bsb bsc bsi bsk bsl bso bss bst btb btc bti btk btl bto bts btt c-- cbb cbc cbi cbk cbl cbo cbs cbt ccb ccc cci cck ccl cco ccs cct ci- cib cic cii cik cil cio cis cit ckb ckc cki cko cks ckt cl- clb clc cli clk cll clo cls clt co- cob coc coi cok col coo cos cot csb csc csi csk csl cso css cst ctb ctc cti ctk ctl cto cts ctt ibb ibc ibi ibk ibl ibo ibs ibt icb icc ici ick icl ico ics ict iib iic iii iil iio iis iit ikb ikc iki ikk ikl iko iks ikt il- ilb ilc ili ilk ill ilo ils ilt io- iob ioc ioi iol ioo ios iot is- isb isc isi isk isl iso iss ist itb itc iti itk itl ito its itt k-t kbb kbc kbi kbk kbl kbo kbs kcb kcc kci kck kcl kcs kct kib kic kii kik kil kio kis kit kkb kkc kki kkk kkl kks kkt kl- klb klc kli klo kls klt kob koc koi kok kol koo kos kot ksb ksc ksi ksk ksl kso kss kst ktb ktc ktk ktl kto kts ktt lbb lbc lbi lbk lbl lbo lbs lbt lcb lcc lci lck lcl lco lcs lct lib lic lii lik lil lio lis lit lkb lkl lks lkt llb llc lli llk lll llo lls llt lob loc loi lok lol loo los lot lsb lsc lsi lsk lsl lso lss lst ltb ltc lti ltk ltl lto lts ltt o-i ob- obb obc obi obk obl obo obs obt oc- ocb occ oci ock ocl oco ocs oct oib oic oii oik oil oio ois oit okb okc oki okk okl oko oks olb olc oli olk oll olo ols olt oo- oob ooc ooi ook ool ooo oos oot os- osb osc osi osk osl oso oss ost ot- otb otc oti otk otl oto ots ott sbb sbc sbi sbk sbl sbo sbs sbt scb scc sci sck scl sco scs sct sib sic sii sik sil sio sis sit sk- skb skc ski skk skl sko sks skt slb slc sli slk sll slo sls slt sob soc soi sok sol soo sos sot ss- ssb ssc ssi ssk ssl sso sss sst stb stc sti stk stl sto sts stt tbb tbc tbi tbk tbl tbo tbs tbt tcb tcc tci tck tcl tco tcs tct tib tic tii tik til tio tis tit tkb tkc tkk tkl tko tks tkt tlc tli tlk tll tlo tls tlt to- tob toc toi tok tol too tos tot tsb tsc tsi tsk tsl tso tss tst ttb ttc tti ttk ttl tto tts ttt