-er a-a a-b a-i aaa aab aad aae aai aak aar aas ab- aba abb abd abe abi abk abr abs ad- ada adb add ade adi adk adr ads aea aeb aed aee aei aek aer aes ai- aia aib aid aie aii aik air ais aka akb akd ake aki akk akr aks ar- ara arb ard are ari ark arr ars as- asa asb asd ase asi ask asr ass baa bab bad bae bai bak bar bas bba bbb bbd bbe bbi bbk bbr bbs bda bdb bdd bde bdi bdk bdr bds be- bea beb bed bee bei bek ber bes bi- bia bib bid bie bii bik bir bis bka bkb bke bkk bkr bks bra brb brd bre bri brk brr brs bsa bsb bsd bse bsi bsk bsr bss daa dab dad dae dai dak dar das dba dbb dbd dbe dbi dbk dbr dbs dda ddb ddd dde ddi ddk ddr dds de- dea deb ded dee dei dek der des di- dia dib did die dii dik dir dis dka dkb dke dki dkk dkr dks dra drb drd dre dri drk drr drs dsa dsb dsd dse dsi dsk dsr dss eaa eab ead eae eai eak ear eas eba ebb ebd ebe ebi ebk ebr ebs ed- eda edb edd ede edi edk edr eds eea eeb eed eee eek eer ees eia eib eid eie eii eik eir eis eka ekb ekd eke eki ekr eks era erb erd ere eri erk err ers es- esa esb esd ese esi esk esr ess i-d ia- iaa iab iad iae iai iar ias iba ibb ibd ibe ibi ibk ibr ibs ida idb idd ide idi idk idr ids ie- iea ied iee iei iek ier ies iia iib iid iie iii iir iis ika ikb ike iki ikk ikr iks ir- ira irb ird ire iri irk irr irs is- isa isb isd ise isi isk isr iss ka- kaa kab kad kae kai kak kar kas kba kbb kbd kbe kbi kbk kbr kbs kda kdb kde kdk kdr kds ke- kea keb ked kee kei kek ker kes kia kib kid kie kii kik kir kis kkb kke kki kkk kkr kks kra krd kri krk krr krs ksa ksb ksd kse ksi ksk ksr kss ra- raa rab rad rae rai rak rar ras rba rbb rbd rbe rbi rbk rbr rbs rda rdb rdd rde rdi rdr rds re- rea reb red ree rei rek rer res ria rib rid rie rii rik rir ris rkb rke rkk rks rra rrb rrd rri rrk rrr rrs rsa rsb rsd rse rsi rsk rsr rss saa sab sad sae sai sak sar sas sba sbb sbd sbe sbi sbk sbr sbs sda sdb sdd sde sdi sdk sdr sds se- sea seb sed see sei sek ser ses sia sib sid sie sii sik sir sis sk- ska skb skd ske ski skk skr sks sr- sra srb srd sre sri srk srr srs ss- ssa ssb ssd sse ssi ssk ssr sss