a-a a-b a-i aaa aab aad aai aan aao aap aar aas ab- aba abb abd abi abn abo abp abr abs ad- ada adb add adi adn ado adp adr ads ai- aia aib aid aii ain aio aip air ais an- ana anb and ani ann ano anp anr ans aoa aob aod aoi aon aoo aop aor aos ap- apa apb apd api apn apo app apr aps ar- ara arb ard ari arn aro arp arr ars as- asa asb asd asi asn aso asp asr ass b-p baa bab bad bai ban bao bap bar bas bba bbb bbd bbi bbn bbo bbp bbr bbs bda bdb bdd bdi bdo bdp bdr bds bi- bia bib bid bii bin bio bip bir bis bna bnb bnd bni bnn bno bnp bnr bns boa bob bod boi bon boo bop bor bos bpa bpb bpd bpi bpn bpo bpp bpr bps bra brb brd bri brn bro brp brr brs bsa bsb bsd bsi bsn bso bsp bsr bss daa dab dad dai dan dao dap dar das dba dbb dbd dbi dbn dbo dbp dbr dbs dda ddb ddd ddi ddn ddo ddp ddr dds di- dia dib did dii din dio dip dir dis dna dnb dnd dni dnn dno dnp dnr dns doa dob dod doi don doo dop dor dos dpa dpb dpd dpi dpn dpo dpp dpr dps dra drb drd dri drn dro drp drr drs dsa dsb dsd dsi dsn dso dsp dsr dss i-d ia- iaa iab iad iai ian iao iap iar ias iba ibb ibd ibi ibn ibo ibp ibr ibs ida idb idd idi idn ido idp idr ids iia iib iid iii iin iio iip iir iis in- ina inb ind ini inn ino inp inr ins io- ioa iob iod ioi ion ioo iop ior ios ipa ipb ipd ipi ipn ipo ipp ipr ips ir- ira irb ird iri irn iro irp irr irs is- isa isb isd isi isn iso isp isr iss n-i naa nab nad nai nan nao nap nar nas nba nbb nbd nbi nbn nbo nbp nbr nbs nda ndb ndd ndi ndn ndo ndp ndr nds nia nib nid nii nin nio nip nir nis nna nnb nni nnn nno nnp nns no- noa nob nod noi non noo nop nor nos npa npb npd npi npn npo npp npr nps nra nrb nrd nri nrn nro nrp nrr nrs nsa nsb nsd nsi nsn nso nsp nsr nss o-i oaa oab oad oai oan oao oap oar oas ob- oba obb obd obi obn obo obp obr obs oda odb odd odi odn odo odp odr ods oia oib oid oii oin oio oip oir ois on- ona onb ond oni onn ono onp onr ons oo- ooa oob ood ooi oon ooo oop oor oos op- opa opb opd opi opn opo opp opr ops or- ora orb ord ori orn oro orp orr ors os- osa osb osd osi osn oso osp osr oss p-p paa pab pad pai pan pao pap par pas pba pbb pbd pbi pbn pbo pbp pbr pbs pda pdb pdd pdi pdn pdo pdp pdr pds pia pib pid pii pin pio pip pir pis pn- pna pnb pnd pni pnn pno pnp pnr pns poa pob pod poi pon poo pop por pos ppa ppb ppd ppi ppn ppo ppp ppr pps pra prb prd pri prn pro prp prr prs ps- psa psb psd psi psn pso psp psr pss ra- raa rab rad rai ran rao rap rar ras rba rbb rbd rbi rbn rbo rbp rbr rbs rda rdb rdd rdi rdn rdo rdp rdr rds ria rib rid rii rin rio rip rir ris rna rnb rnd rni rnn rno rnp rnr rns roa rob rod roi ron roo rop ror ros rpa rpb rpd rpi rpn rpo rpp rpr rps rra rrb rrd rri rrn rrp rrr rrs rsa rsb rsd rsi rsn rso rsp rsr rss saa sab sad sai san sao sap sar sas sba sbb sbd sbi sbn sbo sbp sbr sbs sda sdb sdd sdi sdn sdo sdp sdr sds sia sib sid sii sin sio sip sir sis sna snb snd sni snn sno snp snr sns soa sob sod soi son soo sop sor sos spa spb spd spi spn spo spp spr sps sr- sra srb srd sri srn sro srp srr srs ss- ssa ssb ssd ssi ssn sso ssp ssr sss