a-a a-b a-i aaa aab aae aai aak aan aao aap aas ab- aba abb abe abi abk abn abo abp abs aea aeb aee aei aek aen aeo aep aes ai- aia aib aie aii aik ain aio aip ais aka akb ake aki akk akn ako akp aks an- ana anb ane ani ank ann ano anp ans aoa aob aoe aoi aok aon aoo aop aos ap- apa apb ape api apk apn apo app aps as- asa asb ase asi ask asn aso asp ass b-p baa bab bae bai bak ban bao bap bas bba bbb bbe bbi bbk bbn bbo bbp bbs be- bea beb bee bei bek ben beo bep bes bi- bia bib bie bii bik bin bio bip bis bka bkb bke bkk bkn bko bkp bks bna bnb bne bni bnk bnn bno bnp bns boa bob boe boi bok bon boo bop bos bpa bpb bpe bpi bpn bpo bpp bps bsa bsb bse bsi bsk bsn bso bsp bss eaa eab eae eai eak ean eao eap eas eba ebb ebe ebi ebk ebn ebo ebp ebs eea eeb eee eek een eeo eep ees eia eib eie eii eik ein eio eip eis eka ekb eke eki eko ekp eks en- ena enb ene eni enk enn eno enp ens eo- eoa eob eoe eoi eok eon eoo eop eos ep- epa epb epe epi epn epo epp eps es- esa esb ese esi esk esn eso esp ess ia- iaa iab iae iai ian iao iap ias iba ibb ibe ibi ibk ibn ibo ibp ibs ie- iea iee iei iek ien iep ies iia iib iie iii iin iio iip iis ika ikb ike iki ikk iko iks in- ina inb ine ini ink inn ino inp ins io- ioa iob ioe ioi ion ioo iop ios ipa ipb ipe ipi ipn ipo ipp ips is- isa isb ise isi isk isn iso isp iss ka- kaa kab kae kai kak kan kao kap kas kba kbb kbe kbi kbk kbn kbo kbp kbs ke- kea keb kee kei kek ken keo kep kes kia kib kie kii kik kin kio kip kis kkb kke kki kkk kkn kkp kks kn- kna kne kni knk knn kno knp koa kob koe koi kok kon koo kop kos kpa kpe kpi kpk kpn kpo kpp kps ksa ksb kse ksi ksk ksn kso ksp kss n-i naa nab nae nai nak nan nao nap nas nba nbb nbe nbi nbk nbn nbo nbp nbs ne- nea neb nee nei nek nen neo nep nes nia nib nie nii nik nin nio nip nis nka nke nki nkk nkn nko nkp nks nna nnb nne nni nnk nnn nno nnp nns no- noa nob noe noi nok non noo nop nos npa npb npe npi npn npo npp nps nsa nsb nse nsi nsk nsn nso nsp nss o-i oaa oab oae oai oak oan oao oap oas ob- oba obb obe obi obk obn obo obp obs oea oeb oee oei oen oeo oep oes oia oib oie oii oik oin oio oip ois oka okb oke oki okk oko okp oks on- ona onb one oni onk onn ono onp ons oo- ooa oob ooi ook oon ooo oop oos op- opa opb ope opi opk opn opo opp ops os- osa osb ose osi osk osn oso osp oss p-p paa pab pae pai pak pan pao pap pas pba pbb pbe pbi pbk pbn pbo pbp pbs pea peb pee pei pek pen peo pep pes pia pib pie pii pik pin pio pip pis pka pkb pke pki pkn pko pkp pks pn- pna pnb pne pni pnk pnn pno pnp pns poa pob poe poi pok pon poo pop pos ppa ppb ppe ppi ppk ppn ppo ppp pps ps- psa psb pse psi psk psn pso psp pss saa sab sae sai sak san sao sap sas sba sbb sbe sbi sbk sbn sbo sbp sbs se- sea seb see sei sek sen seo sep ses sia sib sie sii sik sin sio sip sis sk- ska skb ske ski skk sko skp sks sna snb sne sni snk snn sno snp sns soa sob soe soi sok son soo sop sos spa spb spe spi spk spn spo spp sps ss- ssa ssb sse ssi ssk ssn sso ssp sss