-ic -ol bbb bbc bbi bbk bbl bbo bbt bcb bcc bci bck bcl bco bct bi- bib bic bii bik bil bio bit bkb bkc bkk bkl bko bkt blb blc bli blk bll blo blt bob boc boi bok bol boo bot btb btc bti btk btl bto btt c-- cbb cbc cbi cbk cbl cbo cbt ccb ccc cci cck ccl cco cct ci- cib cic cii cik cil cio cit ckb ckc cki cko ckt cl- clb clc cli clk cll clo clt co- cob coc coi cok col coo cot ctb ctc cti ctk ctl cto ctt ibb ibc ibi ibk ibl ibo ibt icb icc ici ick icl ico ict iib iic iii iil iio iit ikb ikc iki ikk ikl iko ikt il- ilb ilc ili ilk ill ilo ilt io- iob ioc ioi iol ioo iot itb itc iti itk itl ito itt k-t kbb kbc kbi kbk kbl kbo kcb kcc kci kck kcl kct kib kic kii kik kil kio kit kkb kkc kki kkk kkl kkt kl- klb klc kli klo klt kob koc koi kok kol koo kot ktb ktc ktk ktl kto ktt lbb lbc lbi lbk lbl lbo lbt lcb lcc lci lck lcl lco lct lib lic lii lik lil lio lit lkb lkl lkt llb llc lli llk lll llo llt lob loc loi lok lol loo lot ltb ltc lti ltk ltl lto ltt o-i ob- obb obc obi obk obl obo obt oc- ocb occ oci ock ocl oco oct oib oic oii oik oil oio oit okb okc oki okk okl oko olb olc oli olk oll olo olt oo- oob ooc ooi ook ool ooo oot ot- otb otc oti otk otl oto ott tbb tbc tbi tbk tbl tbo tbt tcb tcc tci tck tcl tco tct tib tic tii tik til tio tit tkb tkc tkk tkl tko tkt tlc tli tlk tll tlo tlt to- tob toc toi tok tol too tot ttb ttc tti ttk ttl tto ttt