-er -ol b-u bbb bbc bbe bbh bbk bbl bbo bbr bbu bcb bcc bce bch bck bcl bco bcr bcu be- beb bec bee beh bek bel beo ber beu bhb bhc bhe bhh bhk bhl bho bhr bhu bkb bkc bke bkk bkl bko bkr blb blc ble blh blk bll blo blr blu bob boc boe boh bok bol boo bor bou brb bre brh brk brl bro brr bru bub buc bue buh buk bul buo bur buu c-- cbb cbc cbe cbh cbk cbl cbo cbr cbu ccb ccc cce cch cck ccl cco ccr ccu ce- ceb cec cee ceh cek cel ceo cer ceu ch- chb chc che chh chk chl cho chr chu ckb ckc ckh cko cl- clb clc cle clh clk cll clo clr clu co- cob coc coe coh cok col coo cor cou crb crc cre crh crk crl cro crr cru cub cuc cue cuh cuk cul cuo cur cuu ebb ebc ebe ebh ebk ebl ebo ebr ebu ec- ecb ecc ece ech eck ecl eco ecr ecu eeb eec eee eek eel eeo eer ehb ehc ehe ehh ehl eho ehr ehu ekb ekc eke ekh ekl eko ekr eku elb elc ele elh elk ell elo elr elu eo- eob eoc eoe eoh eok eol eoo eor eou erb erc ere erh erk erl ero err eru eu- eub euc eue eul eur hbb hbc hbe hbh hbk hbl hbo hbr hbu hcb hcc hce hch hck hcl hco hcr he- heb hec hee heh hek hel heo her heu hhb hhc hhe hhh hhk hhl hho hhr hhu hkb hkh hkk hkl hko hkr hku hlb hlc hle hlh hll hlo hlr hlu hob hoc hoe hoh hok hol hoo hor hou hr- hrb hrc hre hrh hrk hrl hro hrr hru hub huc hue huh huk hul huo hur huu kbb kbc kbe kbh kbk kbl kbo kbr kbu kcb kcc kce kch kck kcl kcr kcu ke- keb kec kee keh kek kel keo ker khe khh khk kho khr khu kkb kkc kke kkh kkk kkl kkr kku kl- klb klc klh klo klr klu kob koc koe koh kok kol koo kor kou krc krk krl kro krr kru kub kuc kue kuh kuk kul kur kuu lbb lbc lbe lbh lbk lbl lbo lbr lbu lcb lcc lce lch lck lcl lco lcr lcu leb lec lee leh lek lel leo ler leu lhb lhc lhh lhk lho lhr lhu lkb lkh lkl lkr llb llc lle llk lll llo llr llu lob loc loe loh lok lol loo lor lou lrb lrc lrh lrk lro lrr lru lub luc lue luh luk lul luo lur luu ob- obb obc obe obh obk obl obo obr obu oc- ocb occ och ock ocl oco ocr ocu oeb oec oee oeh oel oeo oer ohc ohe ohh ohl oho ohr ohu okb okc oke okk okl oko okr oku olb olc ole olk oll olo olu oo- oob ooc ooh ook ool ooo oor or- orb orc ore orh ork orl oro orr oru ou- ouc oue ouh ouk oul ouo our rbb rbc rbe rbh rbk rbl rbo rbr rbu rcb rcc rce rch rcl rco rcr rcu re- reb rec ree reh rek rel reo rer reu rh- rhb rhc rhe rhh rhl rho rhr rhu rkb rkc rke rkk rko rku rlc rle rlh rll rlo rlr rlu rob roc roe roh rok rol roo ror rou rrb rrc rrh rrk rrl rrr rru rub ruc rue ruh ruk ruo rur ruu ubb ubc ube ubh ubk ubl ubo ubr ubu ucb ucc uce uch uck ucl uco ucr ucu ueb uec uee ueh uel uer uhb uhc uhe uhh uhl uho uhr uhu ukb ukc uke ukk ukl ukr uku ulb ulc ule ulk ull ulo ulr ulu uob uoc uoe uok uol uoo uor ur- urb urc ure urk url uro urr uru uuc uue uur uuu