-er -ic bbb bbc bbe bbi bbk bbn bbo bbr bbs bcb bcc bce bci bck bcn bco bcr bcs be- beb bec bee bei bek ben beo ber bes bi- bib bic bie bii bik bin bio bir bis bkb bkc bke bkk bkn bko bkr bks bnb bnc bne bni bnk bnn bno bnr bns bob boc boe boi bok bon boo bor bos brb bre bri brk brn bro brr brs bsb bsc bse bsi bsk bsn bso bsr bss c-- cbb cbc cbe cbi cbk cbn cbo cbr cbs ccb ccc cce cci cck ccn cco ccr ccs ce- ceb cec cee cei cek cen ceo cer ces ci- cib cic cie cii cik cin cio cir cis ckb ckc cki cko cks cn- cnb cnc cne cni cnn cno cnr cns co- cob coc coe coi cok con coo cor cos crb crc cre cri crk crn cro crr crs csb csc cse csi csk csn cso csr css ebb ebc ebe ebi ebk ebn ebo ebr ebs ec- ecb ecc ece eci eck ecn eco ecr ecs eeb eec eee eek een eeo eer ees eib eic eie eii eik ein eio eir eis ekb ekc eke eki eko ekr eks en- enb enc ene eni enk enn eno enr ens eo- eob eoc eoe eoi eok eon eoo eor eos erb erc ere eri erk ern ero err ers es- esb esc ese esi esk esn eso esr ess ibb ibc ibe ibi ibk ibn ibo ibr ibs icb icc ice ici ick icn ico icr ics ie- iec iee iei iek ien ier ies iib iic iie iii iin iio iir iis ikb ikc ike iki ikk iko ikr iks in- inb inc ine ini ink inn ino inr ins io- iob ioc ioe ioi ion ioo ior ios ir- irb irc ire iri irk irn iro irr irs is- isb isc ise isi isk isn iso isr iss kbb kbc kbe kbi kbk kbn kbo kbr kbs kcb kcc kce kci kck kcn kcr kcs ke- keb kec kee kei kek ken keo ker kes kib kic kie kii kik kin kio kir kis kkb kkc kke kki kkk kkn kkr kks kn- knc kne kni knk knn kno knr kob koc koe koi kok kon koo kor kos krc kri krk krn kro krr krs ksb ksc kse ksi ksk ksn kso ksr kss n-i nbb nbc nbe nbi nbk nbn nbo nbr nbs ncb ncc nce nci nck ncn nco ncr ncs ne- neb nec nee nei nek nen neo ner nes nib nic nie nii nik nin nio nir nis nkc nke nki nkk nkn nko nkr nks nnb nnc nne nni nnk nnn nno nns no- nob noc noe noi nok non noo nor nos nrb nrc nre nri nrk nrn nro nrr nrs nsb nsc nse nsi nsk nsn nso nsr nss o-i ob- obb obc obe obi obk obn obo obr obs oc- ocb occ oci ock ocn oco ocr ocs oeb oec oee oei oen oeo oer oes oib oic oie oii oik oin oio oir ois okb okc oke oki okk oko okr oks on- onb onc one oni onk onn ono onr ons oo- oob ooc ooi ook oon ooo oor oos or- orb orc ore ori ork orn oro orr ors os- osb osc ose osi osk osn oso osr oss rbb rbc rbe rbi rbk rbn rbo rbr rbs rcb rcc rce rci rcn rco rcr rcs re- reb rec ree rei rek ren reo rer res rib ric rie rii rik rin rio rir ris rkb rkc rke rkk rko rks rnb rnc rni rnn rno rnr rns rob roc roe roi rok ron roo ror ros rrb rrc rri rrk rrn rrr rrs rsb rsc rse rsi rsk rsn rso rsr rss sbb sbc sbe sbi sbk sbn sbo sbr sbs scb scc sce sci sck scn sco scr scs se- seb sec see sei sek sen seo ser ses sib sic sie sii sik sin sio sir sis sk- skb skc ske ski skk sko skr sks snb snc sne sni snk snn sno snr sns sob soc soe soi sok son soo sor sos sr- srb src sre sri srk srn sro srr srs ss- ssb ssc sse ssi ssk ssn sso ssr sss