-er a-a a-b a-i a-t aaa aab aae aai aan aao aap aar aas aat ab- aba abb abe abi abn abo abp abr abs abt aea aeb aee aei aen aeo aep aer aes aet ai- aia aib aie aii ain aio aip air ais ait an- ana anb ane ani ann ano anp anr ans ant aoa aob aoe aoi aon aoo aop aor aos aot ap- apa apb ape api apn apo app apr aps apt ar- ara arb are ari arn aro arp arr ars art as- asa asb ase asi asn aso asp asr ass ast at- ata atb ate ati atn ato atp atr ats att b-p baa bab bae bai ban bao bap bar bas bat bba bbb bbe bbi bbn bbo bbp bbr bbs bbt be- bea beb bee bei ben beo bep ber bes bet bi- bia bib bie bii bin bio bip bir bis bit bna bnb bne bni bnn bno bnp bnr bns bnt boa bob boe boi bon boo bop bor bos bot bpa bpb bpe bpi bpn bpo bpp bpr bps bpt bra brb bre bri brn bro brp brr brs brt bsa bsb bse bsi bsn bso bsp bsr bss bst bta btb bte bti btn bto btp btr bts btt eaa eab eae eai ean eao eap ear eas eat eba ebb ebe ebi ebn ebo ebp ebr ebs ebt eea eeb eee een eeo eep eer ees eet eia eib eie eii ein eio eip eir eis eit en- ena enb ene eni enn eno enp enr ens ent eo- eoa eob eoe eoi eon eoo eop eor eos eot ep- epa epb epe epi epn epo epp epr eps ept era erb ere eri ern ero erp err ers ert es- esa esb ese esi esn eso esp esr ess est eta etb ete eti etn eto etp etr ets ett ia- iaa iab iae iai ian iao iap iar ias iat iba ibb ibe ibi ibn ibo ibp ibr ibs ibt ie- iea iee iei ien iep ier ies iet iia iib iie iii iin iio iip iir iis iit in- ina inb ine ini inn ino inp inr ins int io- ioa iob ioe ioi ion ioo iop ior ios iot ipa ipb ipe ipi ipn ipo ipp ipr ips ipt ir- ira irb ire iri irn iro irp irr irs irt is- isa isb ise isi isn iso isp isr iss ist ita itb ite iti itn ito itp its itt n-i naa nab nae nai nan nao nap nar nas nat nba nbb nbe nbi nbn nbo nbp nbr nbs nbt ne- nea neb nee nei nen neo nep ner nes net nia nib nie nii nin nio nip nir nis nit nna nnb nne nni nnn nno nnp nns nnt no- noa nob noe noi non noo nop nor nos not npa npb npe npi npn npo npp npr nps npt nra nrb nre nri nrn nro nrp nrr nrs nrt nsa nsb nse nsi nsn nso nsp nsr nss nst nta ntb nte nti ntn nto ntp ntr nts ntt o-i oaa oab oae oai oan oao oap oar oas oat ob- oba obb obe obi obn obo obp obr obs obt oea oeb oee oei oen oeo oep oer oes oet oia oib oie oii oin oio oip oir ois oit on- ona onb one oni onn ono onp onr ons ont oo- ooa oob ooi oon ooo oop oor oos oot op- opa opb ope opi opn opo opp opr ops opt or- ora orb ore ori orn oro orp orr ors ort os- osa osb ose osi osn oso osp osr oss ost ot- ota otb ote oti otn oto otp otr ots ott p-p paa pab pae pai pan pao pap par pas pat pba pbb pbe pbi pbn pbo pbp pbr pbs pbt pea peb pee pei pen peo pep per pes pet pia pib pie pii pin pio pip pir pis pit pn- pna pnb pne pni pnn pno pnp pnr pns pnt poa pob poe poi pon poo pop por pos pot ppa ppb ppe ppi ppn ppo ppp ppr pps ppt pra prb pre pri prn pro prp prr prs prt ps- psa psb pse psi psn pso psp psr pss pst pt- pta ptb pte pti ptn pto ptp ptr pts ptt ra- raa rab rae rai ran rao rap rar ras rat rba rbb rbe rbi rbn rbo rbp rbr rbs rbt re- rea reb ree rei ren reo rep rer res ret ria rib rie rii rin rio rip rir ris rit rna rnb rni rnn rno rnp rnr rns rnt roa rob roe roi ron roo rop ror ros rot rpa rpb rpe rpi rpn rpo rpp rpr rps rpt rra rrb rri rrn rrp rrr rrs rrt rsa rsb rse rsi rsn rso rsp rsr rss rst rta rtb rte rti rtn rto rtp rtr rts rtt saa sab sae sai san sao sap sar sas sat sba sbb sbe sbi sbn sbo sbp sbr sbs sbt se- sea seb see sei sen seo sep ser ses set sia sib sie sii sin sio sip sir sis sit sna snb sne sni snn sno snp snr sns snt soa sob soe soi son soo sop sor sos sot spa spb spe spi spn spo spp spr sps spt sr- sra srb sre sri srn sro srp srr srs srt ss- ssa ssb sse ssi ssn sso ssp ssr sss sst sta stb ste sti stn sto stp str sts stt taa tab tae tai tan tao tap tar tas tat tba tbb tbe tbi tbn tbo tbp tbr tbs tbt te- tea teb tee tei ten teo tep ter tes tet tia tib tie tii tin tio tip tir tis tit tna tnb tne tni tnn tno tnp tnr tns tnt to- toa tob toe toi ton too top tor tos tot tpa tpb