-er -ol bbb bbc bbe bbh bbk bbl bbo bbr bcb bcc bce bch bck bcl bco bcr be- beb bec bee beh bek bel beo ber bhb bhc bhe bhh bhk bhl bho bhr bkb bkc bke bkk bkl bko bkr blb blc ble blh blk bll blo blr bob boc boe boh bok bol boo bor brb bre brh brk brl bro brr c-- cbb cbc cbe cbh cbk cbl cbo cbr ccb ccc cce cch cck ccl cco ccr ce- ceb cec cee ceh cek cel ceo cer ch- chb chc che chh chk chl cho chr ckb ckc ckh cko cl- clb clc cle clh clk cll clo clr co- cob coc coe coh cok col coo cor crb crc cre crh crk crl cro crr ebb ebc ebe ebh ebk ebl ebo ebr ec- ecb ecc ece ech eck ecl eco ecr eeb eec eee eek eel eeo eer ehb ehc ehe ehh ehl eho ehr ekb ekc eke ekh ekl eko ekr elb elc ele elh elk ell elo elr eo- eob eoc eoe eoh eok eol eoo eor erb erc ere erh erk erl ero err hbb hbc hbe hbh hbk hbl hbo hbr hcb hcc hce hch hck hcl hco hcr he- heb hec hee heh hek hel heo her hhb hhc hhe hhh hhk hhl hho hhr hkb hkh hkk hkl hko hkr hlb hlc hle hlh hll hlo hlr hob hoc hoe hoh hok hol hoo hor hr- hrb hrc hre hrh hrk hrl hro hrr kbb kbc kbe kbh kbk kbl kbo kbr kcb kcc kce kch kck kcl kcr ke- keb kec kee keh kek kel keo ker khe khh khk kho khr kkb kkc kke kkh kkk kkl kkr kl- klb klc klh klo klr kob koc koe koh kok kol koo kor krc krk krl kro krr lbb lbc lbe lbh lbk lbl lbo lbr lcb lcc lce lch lck lcl lco lcr leb lec lee leh lek lel leo ler lhb lhc lhh lhk lho lhr lkb lkh lkl lkr llb llc lle llk lll llo llr lob loc loe loh lok lol loo lor lrb lrc lrh lrk lro lrr ob- obb obc obe obh obk obl obo obr oc- ocb occ och ock ocl oco ocr oeb oec oee oeh oel oeo oer ohc ohe ohh ohl oho ohr okb okc oke okk okl oko okr olb olc ole olk oll olo oo- oob ooc ooh ook ool ooo oor or- orb orc ore orh ork orl oro orr rbb rbc rbe rbh rbk rbl rbo rbr rcb rcc rce rch rcl rco rcr re- reb rec ree reh rek rel reo rer rh- rhb rhc rhe rhh rhl rho rhr rkb rkc rke rkk rko rlc rle rlh rll rlo rlr rob roc roe roh rok rol roo ror rrb rrc rrh rrk rrl rrr