a-a a-b a-c aaa aab aac aad aak aar aas aay ab- aba abb abc abd abk abr abs aby ac- aca acb acc acd ack acr acs acy ad- ada adb adc add adk adr ads ady aka akb akc akd akk akr aks ar- ara arb arc ard ark arr ars ary as- asa asb asc asd ask asr ass asy ay- aya ayc ayd ayk ayr ays baa bab bac bad bak bar bas bay bba bbb bbc bbd bbk bbr bbs bby bca bcb bcc bcd bck bcr bcs bcy bda bdb bdc bdd bdk bdr bds bdy bka bkb bkc bkk bkr bks bra brb brd brk brr brs bry bsa bsb bsc bsd bsk bsr bss bsy by- bya byc byd byk byr bys c-- caa cab cac cad cak car cas cay cba cbb cbc cbd cbk cbr cbs cby cca ccb ccc ccd cck ccr ccs cda cdb cdc cdd cdk cdr cds cdy cka ckb ckc ckd cks cky cra crb crc crd crk crr crs cry csa csb csc csd csk csr css csy cya cyb cyc cyd cyk cyr cys daa dab dac dad dak dar das day dba dbb dbc dbd dbk dbr dbs dby dca dcb dcc dcd dck dcr dcs dda ddb ddc ddd ddk ddr dds ddy dka dkb dkc dkk dkr dks dra drb drc drd drk drr drs dry dsa dsb dsc dsd dsk dsr dss dsy dy- dya dyb dyc dyd dyk dyr dys dyy ka- kaa kab kac kad kak kar kas kay kba kbb kbc kbd kbk kbr kbs kca kcb kcc kcd kck kcr kcs kda kdb kdc kdk kdr kds kdy kkb kkc kkk kkr kks kky kra krc krd krk krr krs kry ksa ksb ksc ksd ksk ksr kss kya kyc kyd kyr kys ra- raa rab rac rad rak rar ras ray rba rbb rbc rbd rbk rbr rbs rca rcb rcc rcd rcr rcs rda rdb rdc rdd rdr rds rdy rkb rkc rkk rks rky rra rrb rrc rrd rrk rrr rrs rsa rsb rsc rsd rsk rsr rss ry- rya ryc ryd ryk ryr rys ryy saa sab sac sad sak sar sas say sba sbb sbc sbd sbk sbr sbs sby sca scb scc scd sck scr scs sda sdb sdc sdd sdk sdr sds sdy sk- ska skb skc skd skk skr sks sky sr- sra srb src srd srk srr srs sry ss- ssa ssb ssc ssd ssk ssr sss sy- sya syb syc syd syk syr sys yaa yab yac yad yak yar yas yay ybc ybr ybs yby yca ycc ycd ycs ycy yda yds ydy yka ykk yra yrc yrs ysa ysb ysc ysk ysr yss ysy yyb yyc yys yyy