-er a-a a-b a-i a-t aaa aab aae aai aak aap aar aas aat ab- aba abb abe abi abk abp abr abs abt aea aeb aee aei aek aep aer aes aet ai- aia aib aie aii aik aip air ais ait aka akb ake aki akk akp akr aks ap- apa apb ape api apk app apr aps apt ar- ara arb are ari ark arp arr ars art as- asa asb ase asi ask asp asr ass ast at- ata atb ate ati atp atr ats att b-p baa bab bae bai bak bap bar bas bat bba bbb bbe bbi bbk bbp bbr bbs bbt be- bea beb bee bei bek bep ber bes bet bi- bia bib bie bii bik bip bir bis bit bka bkb bke bkk bkp bkr bks bkt bpa bpb bpe bpi bpp bpr bps bpt bra brb bre bri brk brp brr brs brt bsa bsb bse bsi bsk bsp bsr bss bst bta btb bte bti btk btp btr bts btt eaa eab eae eai eak eap ear eas eat eba ebb ebe ebi ebk ebp ebr ebs ebt eea eeb eee eek eep eer ees eet eia eib eie eii eik eip eir eis eit eka ekb eke eki ekp ekr eks ekt ep- epa epb epe epi epp epr eps ept era erb ere eri erk erp err ers ert es- esa esb ese esi esk esp esr ess est eta etb ete eti etk etp etr ets ett ia- iaa iab iae iai iap iar ias iat iba ibb ibe ibi ibk ibp ibr ibs ibt ie- iea iee iei iek iep ier ies iet iia iib iie iii iip iir iis iit ika ikb ike iki ikk ikr iks ikt ipa ipb ipe ipi ipp ipr ips ipt ir- ira irb ire iri irk irp irr irs irt is- isa isb ise isi isk isp isr iss ist ita itb ite iti itk itp its itt k-t ka- kaa kab kae kai kak kap kar kas kat kba kbb kbe kbi kbk kbp kbr kbs ke- kea keb kee kei kek kep ker kes ket kia kib kie kii kik kip kir kis kit kkb kke kki kkk kkp kkr kks kkt kpa kpe kpi kpk kpp kpr kps kpt kra kri krk krp krr krs krt ksa ksb kse ksi ksk ksp ksr kss kst kta ktb kte ktk ktp ktr kts ktt p-p paa pab pae pai pak pap par pas pat pba pbb pbe pbi pbk pbp pbr pbs pbt pea peb pee pei pek pep per pes pet pia pib pie pii pik pip pir pis pit pka pkb pke pki pkp pkr pks pkt ppa ppb ppe ppi ppk ppp ppr pps ppt pra prb pre pri prk prp prr prs prt ps- psa psb pse psi psk psp psr pss pst pt- pta ptb pte pti ptk ptp ptr pts ptt ra- raa rab rae rai rak rap rar ras rat rba rbb rbe rbi rbk rbp rbr rbs rbt re- rea reb ree rei rek rep rer res ret ria rib rie rii rik rip rir ris rit rkb rke rkk rkp rks rkt rpa rpb rpe rpi rpk rpp rpr rps rpt rra rrb rri rrk rrp rrr rrs rrt rsa rsb rse rsi rsk rsp rsr rss rst rta rtb rte rti rtk rtp rtr rts rtt saa sab sae sai sak sap sar sas sat sba sbb sbe sbi sbk sbp sbr sbs sbt se- sea seb see sei sek sep ser ses set sia sib sie sii sik sip sir sis sit sk- ska skb ske ski skk skp skr sks skt spa spb spe spi spk spp spr sps spt sr- sra srb sre sri srk srp srr srs srt ss- ssa ssb sse ssi ssk ssp ssr sss sst sta stb ste sti stk stp str sts stt taa tab tae tai tak tap tar tas tat tba tbb tbe tbi tbk tbp tbr tbs tbt te- tea teb tee tei tek tep ter tes tet tia tib tie tii tik tip tir tis tit tka tkb tke tkk tkp tkr tks tkt tpa tpb tpe tpi tpk tpp tpr tps tpt tra trb tre tri trk trp trr trs trt tsa tsb tse tsi tsk tsp tsr tss tst tta ttb tte tti ttk ttp ttr tts ttt