-er a-a a-b a-i aaa aab aae aah aai aao aap aar aas ab- aba abb abe abh abi abo abp abr abs aea aeb aee aeh aei aeo aep aer aes aha ahb ahe ahh ahi aho ahp ahr ahs ai- aia aib aie aih aii aio aip air ais aoa aob aoe aoh aoi aoo aop aor aos ap- apa apb ape aph api apo app apr aps ar- ara arb are arh ari aro arp arr ars as- asa asb ase ash asi aso asp asr ass b-p baa bab bae bah bai bao bap bar bas bba bbb bbe bbh bbi bbo bbp bbr bbs be- bea beb bee beh bei beo bep ber bes bha bhb bhe bhh bhi bho bhp bhr bhs bi- bia bib bie bih bii bio bip bir bis boa bob boe boh boi boo bop bor bos bpa bpb bpe bph bpi bpo bpp bpr bps bra brb bre brh bri bro brp brr brs bsa bsb bse bsh bsi bso bsp bsr bss eaa eab eae eah eai eao eap ear eas eba ebb ebe ebh ebi ebo ebp ebr ebs eea eeb eee eeo eep eer ees eha ehb ehe ehh ehi eho ehp ehr ehs eia eib eie eii eio eip eir eis eo- eoa eob eoe eoh eoi eoo eop eor eos ep- epa epb epe eph epi epo epp epr eps era erb ere erh eri ero erp err ers es- esa esb ese esh esi eso esp esr ess h-i haa hab hae hah hai hao hap har has hba hbb hbe hbh hbi hbo hbp hbr hbs he- hea heb hee heh hei heo hep her hes hha hhb hhe hhh hhi hho hhp hhr hhs hia hib hie hih hii hio hip hir his hoa hob hoe hoh hoi hoo hop hor hos hpa hpb hpe hph hpi hpo hpp hpr hps hr- hra hrb hre hrh hri hro hrp hrr hrs hsa hsb hse hsh hsi hsp hsr hss ia- iaa iab iae iah iai iao iap iar ias iba ibb ibe ibh ibi ibo ibp ibr ibs ie- iea iee iei iep ier ies iha ihb ihe ihh ihi iho ihp ihr ihs iia iib iie iih iii iio iip iir iis io- ioa iob ioe ioh ioi ioo iop ior ios ipa ipb ipe ipi ipo ipp ipr ips ir- ira irb ire iri iro irp irr irs is- isa isb ise ish isi iso isp isr iss o-i oaa oab oae oah oai oao oap oar oas ob- oba obb obe obh obi obo obp obr obs oea oeb oee oeh oei oeo oep oer oes oha ohe ohh ohi oho ohp ohr ohs oia oib oie oii oio oip oir ois oo- ooa oob ooh ooi ooo oop oor oos op- opa opb ope oph opi opo opp opr ops or- ora orb ore orh ori oro orp orr ors os- osa osb ose osh osi oso osp osr oss p-p paa pab pae pah pai pao pap par pas pba pbb pbe pbi pbo pbp pbr pbs pea peb pee peh pei peo pep per pes pha phb phe phi pho php phr phs pia pib pie pih pii pio pip pir pis poa pob poe poh poi poo pop por pos ppa ppb ppe pph ppi ppo ppp ppr pps pra prb pre prh pri pro prp prr prs ps- psa psb pse psh psi pso psp psr pss ra- raa rab rae rah rai rao rap rar ras rba rbb rbe rbh rbi rbo rbp rbr rbs re- rea reb ree reh rei reo rep rer res rh- rha rhb rhe rhh rhi rho rhp rhr rhs ria rib rie rih rii rio rip rir ris roa rob roe roh roi roo rop ror ros rpa rpb rpe rph rpi rpo rpp rpr rps rra rrb rrh rri rrp rrr rrs rsa rsb rse rsh rsi rso rsp rsr rss saa sab sae sah sai sao sap sar sas sba sbb sbe sbh sbi sbo sbp sbr sbs se- sea seb see seh sei seo sep ser ses sh- sha shb she shh shi sho shp shr shs sia sib sie sih sii sio sip sir sis soa sob soe soh soi soo sop sor sos spa spb spe sph spi spo spp spr sps sr- sra srb sre srh sri sro srp srr srs ss- ssa ssb sse ssh ssi sso ssp ssr sss