-er a-a a-b a-i a-t aaa aab aad aae aai aap aar aas aat ab- aba abb abd abe abi abp abr abs abt ad- ada adb add ade adi adp adr ads adt aea aeb aed aee aei aep aer aes aet ai- aia aib aid aie aii aip air ais ait ap- apa apb apd ape api app apr aps apt ar- ara arb ard are ari arp arr ars art as- asa asb asd ase asi asp asr ass ast at- ata atb atd ate ati atp atr ats att b-p baa bab bad bae bai bap bar bas bat bba bbb bbd bbe bbi bbp bbr bbs bbt bda bdb bdd bde bdi bdp bdr bds bdt be- bea beb bed bee bei bep ber bes bet bi- bia bib bid bie bii bip bir bis bit bpa bpb bpd bpe bpi bpp bpr bps bpt bra brb brd bre bri brp brr brs brt bsa bsb bsd bse bsi bsp bsr bss bst bta btb btd bte bti btp btr bts btt daa dab dad dae dai dap dar das dat dba dbb dbd dbe dbi dbp dbr dbs dbt dda ddb ddd dde ddi ddp ddr dds ddt de- dea deb ded dee dei dep der des det di- dia dib did die dii dip dir dis dit dpa dpb dpd dpe dpi dpp dpr dps dpt dra drb drd dre dri drp drr drs drt dsa dsb dsd dse dsi dsp dsr dss dst dta dtb dtd dte dti dtp dtr dts dtt eaa eab ead eae eai eap ear eas eat eba ebb ebd ebe ebi ebp ebr ebs ebt ed- eda edb edd ede edi edp edr eds edt eea eeb eed eee eep eer ees eet eia eib eid eie eii eip eir eis eit ep- epa epb epd epe epi epp epr eps ept era erb erd ere eri erp err ers ert es- esa esb esd ese esi esp esr ess est eta etb etd ete eti etp etr ets ett i-d ia- iaa iab iad iae iai iap iar ias iat iba ibb ibd ibe ibi ibp ibr ibs ibt ida idb idd ide idi idp idr ids idt ie- iea ied iee iei iep ier ies iet iia iib iid iie iii iip iir iis iit ipa ipb ipd ipe ipi ipp ipr ips ipt ir- ira irb ird ire iri irp irr irs irt is- isa isb isd ise isi isp isr iss ist ita itb itd ite iti itp its itt p-p paa pab pad pae pai pap par pas pat pba pbb pbd pbe pbi pbp pbr pbs pbt pda pdb pdd pde pdi pdp pdr pds pdt pea peb ped pee pei pep per pes pet pia pib pid pie pii pip pir pis pit ppa ppb ppd ppe ppi ppp ppr pps ppt pra prb prd pre pri prp prr prs prt ps- psa psb psd pse psi psp psr pss pst pt- pta ptb ptd pte pti ptp ptr pts ptt ra- raa rab rad rae rai rap rar ras rat rba rbb rbd rbe rbi rbp rbr rbs rbt rda rdb rdd rde rdi rdp rdr rds rdt re- rea reb red ree rei rep rer res ret ria rib rid rie rii rip rir ris rit rpa rpb rpd rpe rpi rpp rpr rps rpt rra rrb rrd rri rrp rrr rrs rrt rsa rsb rsd rse rsi rsp rsr rss rst rta rtb rtd rte rti rtp rtr rts rtt saa sab sad sae sai sap sar sas sat sba sbb sbd sbe sbi sbp sbr sbs sbt sda sdb sdd sde sdi sdp sdr sds sdt se- sea seb sed see sei sep ser ses set sia sib sid sie sii sip sir sis sit spa spb spd spe spi spp spr sps spt sr- sra srb srd sre sri srp srr srs srt ss- ssa ssb ssd sse ssi ssp ssr sss sst sta stb std ste sti stp str sts stt taa tab tad tae tai tap tar tas tat tba tbb tbd tbe tbi tbp tbr tbs tbt tda tdb tdd tde tdi tdp tdr tds tdt te- tea teb ted tee tei tep ter tes tet tia tib tid tie tii tip tir tis tit tpa tpb tpd tpe tpi tpp tpr tps tpt tra trb trd tre tri trp trr trs trt tsa tsb tsd tse tsi tsp tsr tss tst tta ttb ttd tte tti ttp ttr tts ttt