-er -ic bbb bbc bbe bbh bbi bbk bbo bbr bcb bcc bce bch bci bck bco bcr be- beb bec bee beh bei bek beo ber bhb bhc bhe bhh bhi bhk bho bhr bi- bib bic bie bih bii bik bio bir bkb bkc bke bkk bko bkr bob boc boe boh boi bok boo bor brb bre brh bri brk bro brr c-- cbb cbc cbe cbh cbi cbk cbo cbr ccb ccc cce cch cci cck cco ccr ce- ceb cec cee ceh cei cek ceo cer ch- chb chc che chh chi chk cho chr ci- cib cic cie cih cii cik cio cir ckb ckc ckh cki cko co- cob coc coe coh coi cok coo cor crb crc cre crh cri crk cro crr ebb ebc ebe ebh ebi ebk ebo ebr ec- ecb ecc ece ech eci eck eco ecr eeb eec eee eek eeo eer ehb ehc ehe ehh ehi eho ehr eib eic eie eii eik eio eir ekb ekc eke ekh eki eko ekr eo- eob eoc eoe eoh eoi eok eoo eor erb erc ere erh eri erk ero err h-i hbb hbc hbe hbh hbi hbk hbo hbr hcb hcc hce hch hci hck hco hcr he- heb hec hee heh hei hek heo her hhb hhc hhe hhh hhi hhk hho hhr hib hic hie hih hii hik hio hir hkb hkh hki hkk hko hkr hob hoc hoe hoh hoi hok hoo hor hr- hrb hrc hre hrh hri hrk hro hrr ibb ibc ibe ibh ibi ibk ibo ibr icb icc ice ich ici ick ico icr ie- iec iee iei iek ier ihb ihc ihe ihh ihi ihk iho ihr iib iic iie iih iii iio iir ikb ikc ike iki ikk iko ikr io- iob ioc ioe ioh ioi ioo ior ir- irb irc ire iri irk iro irr kbb kbc kbe kbh kbi kbk kbo kbr kcb kcc kce kch kci kck kcr ke- keb kec kee keh kei kek keo ker khe khh khi khk kho khr kib kic kie kih kii kik kio kir kkb kkc kke kkh kki kkk kkr kob koc koe koh koi kok koo kor krc kri krk kro krr o-i ob- obb obc obe obh obi obk obo obr oc- ocb occ och oci ock oco ocr oeb oec oee oeh oei oeo oer ohc ohe ohh ohi oho ohr oib oic oie oii oik oio oir okb okc oke oki okk oko okr oo- oob ooc ooh ooi ook ooo oor or- orb orc ore orh ori ork oro orr rbb rbc rbe rbh rbi rbk rbo rbr rcb rcc rce rch rci rco rcr re- reb rec ree reh rei rek reo rer rh- rhb rhc rhe rhh rhi rho rhr rib ric rie rih rii rik rio rir rkb rkc rke rkk rko rob roc roe roh roi rok roo ror rrb rrc rrh rri rrk rrr