a-a a-b a-i aaa aab aad aai aak aar aas ab- aba abb abd abi abk abr abs ad- ada adb add adi adk adr ads ai- aia aib aid aii aik air ais aka akb akd aki akk akr aks ar- ara arb ard ari ark arr ars as- asa asb asd asi ask asr ass baa bab bad bai bak bar bas bba bbb bbd bbi bbk bbr bbs bda bdb bdd bdi bdk bdr bds bi- bia bib bid bii bik bir bis bka bkb bkk bkr bks bra brb brd bri brk brr brs bsa bsb bsd bsi bsk bsr bss daa dab dad dai dak dar das dba dbb dbd dbi dbk dbr dbs dda ddb ddd ddi ddk ddr dds di- dia dib did dii dik dir dis dka dkb dki dkk dkr dks dra drb drd dri drk drr drs dsa dsb dsd dsi dsk dsr dss i-d ia- iaa iab iad iai iar ias iba ibb ibd ibi ibk ibr ibs ida idb idd idi idk idr ids iia iib iid iii iir iis ika ikb iki ikk ikr iks ir- ira irb ird iri irk irr irs is- isa isb isd isi isk isr iss ka- kaa kab kad kai kak kar kas kba kbb kbd kbi kbk kbr kbs kda kdb kdk kdr kds kia kib kid kii kik kir kis kkb kki kkk kkr kks kra krd kri krk krr krs ksa ksb ksd ksi ksk ksr kss ra- raa rab rad rai rak rar ras rba rbb rbd rbi rbk rbr rbs rda rdb rdd rdi rdr rds ria rib rid rii rik rir ris rkb rkk rks rra rrb rrd rri rrk rrr rrs rsa rsb rsd rsi rsk rsr rss saa sab sad sai sak sar sas sba sbb sbd sbi sbk sbr sbs sda sdb sdd sdi sdk sdr sds sia sib sid sii sik sir sis sk- ska skb skd ski skk skr sks sr- sra srb srd sri srk srr srs ss- ssa ssb ssd ssi ssk ssr sss