-er a-a a-b a-i aaa aab aad aae aai aak aan aap aar aas ab- aba abb abd abe abi abk abn abp abr abs ad- ada adb add ade adi adk adn adp adr ads aea aeb aed aee aei aek aen aep aer aes ai- aia aib aid aie aii aik ain aip air ais aka akb akd ake aki akk akn akp akr aks an- ana anb and ane ani ank ann anp anr ans ap- apa apb apd ape api apk apn app apr aps ar- ara arb ard are ari ark arn arp arr ars as- asa asb asd ase asi ask asn asp asr ass b-p baa bab bad bae bai bak ban bap bar bas bba bbb bbd bbe bbi bbk bbn bbp bbr bbs bda bdb bdd bde bdi bdk bdp bdr bds be- bea beb bed bee bei bek ben bep ber bes bi- bia bib bid bie bii bik bin bip bir bis bka bkb bke bkk bkn bkp bkr bks bna bnb bnd bne bni bnk bnn bnp bnr bns bpa bpb bpd bpe bpi bpn bpp bpr bps bra brb brd bre bri brk brn brp brr brs bsa bsb bsd bse bsi bsk bsn bsp bsr bss daa dab dad dae dai dak dan dap dar das dba dbb dbd dbe dbi dbk dbn dbp dbr dbs dda ddb ddd dde ddi ddk ddn ddp ddr dds de- dea deb ded dee dei dek den dep der des di- dia dib did die dii dik din dip dir dis dka dkb dke dki dkk dkp dkr dks dna dnb dnd dne dni dnk dnn dnp dnr dns dpa dpb dpd dpe dpi dpk dpn dpp dpr dps dra drb drd dre dri drk drn drp drr drs dsa dsb dsd dse dsi dsk dsn dsp dsr dss eaa eab ead eae eai eak ean eap ear eas eba ebb ebd ebe ebi ebk ebn ebp ebr ebs ed- eda edb edd ede edi edk edn edp edr eds eea eeb eed eee eek een eep eer ees eia eib eid eie eii eik ein eip eir eis eka ekb ekd eke eki ekp ekr eks en- ena enb end ene eni enk enn enp enr ens ep- epa epb epd epe epi epn epp epr eps era erb erd ere eri erk ern erp err ers es- esa esb esd ese esi esk esn esp esr ess i-d ia- iaa iab iad iae iai ian iap iar ias iba ibb ibd ibe ibi ibk ibn ibp ibr ibs ida idb idd ide idi idk idn idp idr ids ie- iea ied iee iei iek ien iep ier ies iia iib iid iie iii iin iip iir iis ika ikb ike iki ikk ikr iks in- ina inb ind ine ini ink inn inp inr ins ipa ipb ipd ipe ipi ipn ipp ipr ips ir- ira irb ird ire iri irk irn irp irr irs is- isa isb isd ise isi isk isn isp isr iss ka- kaa kab kad kae kai kak kan kap kar kas kba kbb kbd kbe kbi kbk kbn kbp kbr kbs kda kdb kde kdk kdp kdr kds ke- kea keb ked kee kei kek ken kep ker kes kia kib kid kie kii kik kin kip kir kis kkb kke kki kkk kkn kkp kkr kks kn- kna knd kne kni knk knn knp knr kpa kpd kpe kpi kpk kpn kpp kpr kps kra krd kri krk krn krp krr krs ksa ksb ksd kse ksi ksk ksn ksp ksr kss n-i naa nab nad nae nai nak nan nap nar nas nba nbb nbd nbe nbi nbk nbn nbp nbr nbs nda ndb ndd nde ndi ndk ndn ndp ndr nds ne- nea neb ned nee nei nek nen nep ner nes nia nib nid nie nii nik nin nip nir nis nka nke nki nkk nkn nkp nkr nks nna nnb nne nni nnk nnn nnp nns npa npb npd npe npi npn npp npr nps nra nrb nrd nre nri nrk nrn nrp nrr nrs nsa nsb nsd nse nsi nsk nsn nsp nsr nss p-p paa pab pad pae pai pak pan pap par pas pba pbb pbd pbe pbi pbk pbn pbp pbr pbs pda pdb pdd pde pdi pdk pdn pdp pdr pds pea peb ped pee pei pek pen pep per pes pia pib pid pie pii pik pin pip pir pis pka pkb pkd pke pki pkn pkp pkr pks pn- pna pnb pnd pne pni pnk pnn pnp pnr pns ppa ppb ppd ppe ppi ppk ppn ppp ppr pps pra prb prd pre pri prk prn prp prr prs ps- psa psb psd pse psi psk psn psp psr pss ra- raa rab rad rae rai rak ran rap rar ras rba rbb rbd rbe rbi rbk rbn rbp rbr rbs rda rdb rdd rde rdi rdn rdp rdr rds re- rea reb red ree rei rek ren rep rer res ria rib rid rie rii rik rin rip rir ris rkb rke rkk rkp rks rna rnb rnd rni rnn rnp rnr rns rpa rpb rpd rpe rpi rpk rpn rpp rpr rps rra rrb rrd rri rrk rrn rrp rrr rrs rsa rsb rsd rse rsi rsk rsn rsp rsr rss saa sab sad sae sai sak san sap sar sas sba sbb sbd sbe sbi sbk sbn sbp sbr sbs sda sdb sdd sde sdi sdk sdn sdp sdr sds se- sea seb sed see sei sek sen sep ser ses sia sib sid sie sii sik sin sip sir sis sk- ska skb skd ske ski skk skp skr sks sna snb snd sne sni snk snn snp snr sns spa spb spd spe spi spk spn spp spr sps sr- sra srb srd sre sri srk srn srp srr srs ss- ssa ssb ssd sse ssi ssk ssn ssp ssr sss