-er bbb bbd bbe bbi bbk bbn bbo bbr bbs bdb bdd bde bdi bdk bdo bdr bds be- beb bed bee bei bek ben beo ber bes bi- bib bid bie bii bik bin bio bir bis bkb bke bkk bkn bko bkr bks bnb bnd bne bni bnk bnn bno bnr bns bob bod boe boi bok bon boo bor bos brb brd bre bri brk brn bro brr brs bsb bsd bse bsi bsk bsn bso bsr bss dbb dbd dbe dbi dbk dbn dbo dbr dbs ddb ddd dde ddi ddk ddn ddo ddr dds de- deb ded dee dei dek den deo der des di- dib did die dii dik din dio dir dis dkb dke dki dkk dko dkr dks dnb dnd dne dni dnk dnn dno dnr dns dob dod doe doi dok don doo dor dos drb drd dre dri drk drn dro drr drs dsb dsd dse dsi dsk dsn dso dsr dss ebb ebd ebe ebi ebk ebn ebo ebr ebs ed- edb edd ede edi edk edn edo edr eds eeb eed eee eek een eeo eer ees eib eid eie eii eik ein eio eir eis ekb ekd eke eki eko ekr eks en- enb end ene eni enk enn eno enr ens eo- eob eod eoe eoi eok eon eoo eor eos erb erd ere eri erk ern ero err ers es- esb esd ese esi esk esn eso esr ess i-d ibb ibd ibe ibi ibk ibn ibo ibr ibs idb idd ide idi idk idn ido idr ids ie- ied iee iei iek ien ier ies iib iid iie iii iin iio iir iis ikb ike iki ikk iko ikr iks in- inb ind ine ini ink inn ino inr ins io- iob iod ioe ioi ion ioo ior ios ir- irb ird ire iri irk irn iro irr irs is- isb isd ise isi isk isn iso isr iss kbb kbd kbe kbi kbk kbn kbo kbr kbs kdb kde kdk kdo kdr kds ke- keb ked kee kei kek ken keo ker kes kib kid kie kii kik kin kio kir kis kkb kke kki kkk kkn kkr kks kn- knd kne kni knk knn kno knr kob kod koe koi kok kon koo kor kos krd kri krk krn kro krr krs ksb ksd kse ksi ksk ksn kso ksr kss n-i nbb nbd nbe nbi nbk nbn nbo nbr nbs ndb ndd nde ndi ndk ndn ndo ndr nds ne- neb ned nee nei nek nen neo ner nes nib nid nie nii nik nin nio nir nis nke nki nkk nkn nko nkr nks nnb nne nni nnk nnn nno nns no- nob nod noe noi nok non noo nor nos nrb nrd nre nri nrk nrn nro nrr nrs nsb nsd nse nsi nsk nsn nso nsr nss o-i ob- obb obd obe obi obk obn obo obr obs odb odd ode odi odn odo odr ods oeb oed oee oei oen oeo oer oes oib oid oie oii oik oin oio oir ois okb okd oke oki okk oko okr oks on- onb ond one oni onk onn ono onr ons oo- oob ood ooi ook oon ooo oor oos or- orb ord ore ori ork orn oro orr ors os- osb osd ose osi osk osn oso osr oss rbb rbd rbe rbi rbk rbn rbo rbr rbs rdb rdd rde rdi rdn rdo rdr rds re- reb red ree rei rek ren reo rer res rib rid rie rii rik rin rio rir ris rkb rke rkk rko rks rnb rnd rni rnn rno rnr rns rob rod roe roi rok ron roo ror ros rrb rrd rri rrk rrn rrr rrs rsb rsd rse rsi rsk rsn rso rsr rss sbb sbd sbe sbi sbk sbn sbo sbr sbs sdb sdd sde sdi sdk sdn sdo sdr sds se- seb sed see sei sek sen seo ser ses sib sid sie sii sik sin sio sir sis sk- skb skd ske ski skk sko skr sks snb snd sne sni snk snn sno snr sns sob sod soe soi sok son soo sor sos sr- srb srd sre sri srk srn sro srr srs ss- ssb ssd sse ssi ssk ssn sso ssr sss