a-a a-b aaa aab aad aak aan aar aas ab- aba abb abd abk abn abr abs ad- ada adb add adk adn adr ads aka akb akd akk akn akr aks an- ana anb and ank ann anr ans ar- ara arb ard ark arn arr ars as- asa asb asd ask asn asr ass baa bab bad bak ban bar bas bba bbb bbd bbk bbn bbr bbs bda bdb bdd bdk bdr bds bka bkb bkk bkn bkr bks bna bnb bnd bnk bnn bnr bns bra brb brd brk brn brr brs bsa bsb bsd bsk bsn bsr bss daa dab dad dak dan dar das dba dbb dbd dbk dbn dbr dbs dda ddb ddd ddk ddn ddr dds dka dkb dkk dkr dks dna dnb dnd dnk dnn dnr dns dra drb drd drk drn drr drs dsa dsb dsd dsk dsn dsr dss ka- kaa kab kad kak kan kar kas kba kbb kbd kbk kbn kbr kbs kda kdb kdk kdr kds kkb kkk kkn kkr kks kn- kna knd knk knn knr kra krd krk krn krr krs ksa ksb ksd ksk ksn ksr kss naa nab nad nak nan nar nas nba nbb nbd nbk nbn nbr nbs nda ndb ndd ndk ndn ndr nds nka nkk nkn nkr nks nna nnb nnk nnn nns nra nrb nrd nrk nrn nrr nrs nsa nsb nsd nsk nsn nsr nss ra- raa rab rad rak ran rar ras rba rbb rbd rbk rbn rbr rbs rda rdb rdd rdn rdr rds rkb rkk rks rna rnb rnd rnn rnr rns rra rrb rrd rrk rrn rrr rrs rsa rsb rsd rsk rsn rsr rss saa sab sad sak san sar sas sba sbb sbd sbk sbn sbr sbs sda sdb sdd sdk sdn sdr sds sk- ska skb skd skk skr sks sna snb snd snk snn snr sns sr- sra srb srd srk srn srr srs ss- ssa ssb ssd ssk ssn ssr sss