-er a-a a-b aaa aab aae aah aan aao aap aar aas ab- aba abb abe abh abn abo abp abr abs aea aeb aee aeh aen aeo aep aer aes aha ahb ahe ahh ahn aho ahp ahr ahs an- ana anb ane anh ann ano anp anr ans aoa aob aoe aoh aon aoo aop aor aos ap- apa apb ape aph apn apo app apr aps ar- ara arb are arh arn aro arp arr ars as- asa asb ase ash asn aso asp asr ass b-p baa bab bae bah ban bao bap bar bas bba bbb bbe bbh bbn bbo bbp bbr bbs be- bea beb bee beh ben beo bep ber bes bha bhb bhe bhh bho bhp bhr bhs bna bnb bne bnn bno bnp bnr bns boa bob boe boh bon boo bop bor bos bpa bpb bpe bph bpn bpo bpp bpr bps bra brb bre brh brn bro brp brr brs bsa bsb bse bsh bsn bso bsp bsr bss eaa eab eae eah ean eao eap ear eas eba ebb ebe ebh ebn ebo ebp ebr ebs eea eeb eee een eeo eep eer ees eha ehb ehe ehh ehn eho ehp ehr ehs en- ena enb ene enh enn eno enp enr ens eo- eoa eob eoe eoh eon eoo eop eor eos ep- epa epb epe eph epn epo epp epr eps era erb ere erh ern ero erp err ers es- esa esb ese esh esn eso esp esr ess haa hab hae hah han hao hap har has hba hbb hbe hbh hbn hbo hbp hbr hbs he- hea heb hee heh hen heo hep her hes hha hhb hhe hhh hhn hho hhp hhr hhs hna hnb hne hnh hnn hno hns hoa hob hoe hoh hon hoo hop hor hos hpa hpb hpe hph hpn hpo hpp hpr hps hr- hra hrb hre hrh hrn hro hrp hrr hrs hsa hsb hse hsh hsn hsp hsr hss naa nab nae nah nan nao nap nar nas nba nbb nbe nbn nbo nbp nbr nbs ne- nea neb nee neh nen neo nep ner nes nha nhb nhe nhh nhn nhp nhr nhs nna nnb nne nnh nnn nno nnp nns no- noa nob noe noh non noo nop nor nos npa npb npe nph npn npo npp npr nps nra nrb nre nrn nro nrp nrr nrs nsa nsb nse nsh nsn nso nsp nsr nss oaa oab oae oah oan oao oap oar oas ob- oba obb obe obh obn obo obp obr obs oea oeb oee oeh oen oeo oep oer oes oha ohe ohh ohn oho ohp ohr ohs on- ona onb one onh onn ono onp onr ons oo- ooa oob ooh oon ooo oop oor oos op- opa opb ope oph opn opo opp opr ops or- ora orb ore orh orn oro orp orr ors os- osa osb ose osh osn oso osp osr oss p-p paa pab pae pah pan pao pap par pas pba pbb pbe pbn pbo pbp pbr pbs pea peb pee peh pen peo pep per pes pha phb phe phn pho php phr phs pn- pna pnb pne pnh pnn pno pnp pnr pns poa pob poe poh pon poo pop por pos ppa ppb ppe pph ppn ppo ppp ppr pps pra prb pre prh prn pro prp prr prs ps- psa psb pse psh psn pso psp psr pss ra- raa rab rae rah ran rao rap rar ras rba rbb rbe rbh rbn rbo rbp rbr rbs re- rea reb ree reh ren reo rep rer res rh- rha rhb rhe rhh rhn rho rhp rhr rhs rna rnb rnh rnn rno rnp rnr rns roa rob roe roh ron roo rop ror ros rpa rpb rpe rph rpn rpo rpp rpr rps rra rrb rrh rrn rrp rrr rrs rsa rsb rse rsh rsn rso rsp rsr rss saa sab sae sah san sao sap sar sas sba sbb sbe sbh sbn sbo sbp sbr sbs se- sea seb see seh sen seo sep ser ses sh- sha shb she shh shn sho shp shr shs sna snb sne snn sno snp snr sns soa sob soe soh son soo sop sor sos spa spb spe sph spn spo spp spr sps sr- sra srb sre srh srn sro srp srr srs ss- ssa ssb sse ssh ssn sso ssp ssr sss