-ic -ol bbb bbc bbi bbk bbl bbo bbr bbt bcb bcc bci bck bcl bco bcr bct bi- bib bic bii bik bil bio bir bit bkb bkc bkk bkl bko bkr bkt blb blc bli blk bll blo blr blt bob boc boi bok bol boo bor bot brb bri brk brl bro brr brt btb btc bti btk btl bto btr btt c-- cbb cbc cbi cbk cbl cbo cbr cbt ccb ccc cci cck ccl cco ccr cct ci- cib cic cii cik cil cio cir cit ckb ckc cki cko ckt cl- clb clc cli clk cll clo clr clt co- cob coc coi cok col coo cor cot crb crc cri crk crl cro crr crt ctb ctc cti ctk ctl cto ctr ctt ibb ibc ibi ibk ibl ibo ibr ibt icb icc ici ick icl ico icr ict iib iic iii iil iio iir iit ikb ikc iki ikk ikl iko ikr ikt il- ilb ilc ili ilk ill ilo ilr ilt io- iob ioc ioi iol ioo ior iot ir- irb irc iri irk irl iro irr irt itb itc iti itk itl ito itt k-t kbb kbc kbi kbk kbl kbo kbr kcb kcc kci kck kcl kcr kct kib kic kii kik kil kio kir kit kkb kkc kki kkk kkl kkr kkt kl- klb klc kli klo klr klt kob koc koi kok kol koo kor kot krc kri krk krl kro krr krt ktb ktc ktk ktl kto ktr ktt lbb lbc lbi lbk lbl lbo lbr lbt lcb lcc lci lck lcl lco lcr lct lib lic lii lik lil lio lir lit lkb lkl lkr lkt llb llc lli llk lll llo llr llt lob loc loi lok lol loo lor lot lrb lrc lri lrk lro lrr lrt ltb ltc lti ltk ltl lto ltr ltt o-i ob- obb obc obi obk obl obo obr obt oc- ocb occ oci ock ocl oco ocr oct oib oic oii oik oil oio oir oit okb okc oki okk okl oko okr olb olc oli olk oll olo olt oo- oob ooc ooi ook ool ooo oor oot or- orb orc ori ork orl oro orr ort ot- otb otc oti otk otl oto otr ott rbb rbc rbi rbk rbl rbo rbr rbt rcb rcc rci rcl rco rcr rct rib ric rii rik ril rio rir rit rkb rkc rkk rko rkt rlc rli rll rlo rlr rlt rob roc roi rok rol roo ror rot rrb rrc rri rrk rrl rrr rrt rtb rtc rti rtk rtl rto rtr rtt tbb tbc tbi tbk tbl tbo tbr tbt tcb tcc tci tck tcl tco tcr tct tib tic tii tik til tio tir tit tkb tkc tkk tkl tko tkr tkt tlc tli tlk tll tlo tlr tlt to- tob toc toi tok tol too tor tot trb trc tri trk trl tro trr trt ttb ttc tti ttk ttl tto ttr ttt