a-a a-b a-c a-z aaa aab aac aar aas aau aay aaz ab- aba abb abc abr abs abu aby abz ac- aca acb acc acr acs acu acy acz ar- ara arb arc arr ars aru ary arz as- asa asb asc asr ass asu asy asz au- aua aub auc aur aus auz ay- aya ayc ayr ays ayu ayz az- aza azb azs azu azy azz b-u baa bab bac bar bas bau bay baz bba bbb bbc bbr bbs bbu bby bca bcb bcc bcr bcs bcu bcy bcz bra brb brr brs bru bry brz bsa bsb bsc bsr bss bsu bsy bua bub buc bur bus buu buy buz by- bya byc byr bys byu byz bza bzr bzs bzu bzz c-- caa cab cac car cas cau cay caz cba cbb cbc cbr cbs cbu cby cbz cca ccb ccc ccr ccs ccu ccz cra crb crc crr crs cru cry crz csa csb csc csr css csu csy csz cua cub cuc cur cus cuu cuy cuz cya cyb cyc cyr cys cz- czc ra- raa rab rac rar ras rau ray raz rba rbb rbc rbr rbs rbu rca rcb rcc rcr rcs rcu rra rrb rrc rrr rrs rru rsa rsb rsc rsr rss rsu rua rub ruc rur rus ruu ruy ruz ry- rya ryc ryr rys ryu ryy ryz rza rzb rzy saa sab sac sar sas sau say saz sba sbb sbc sbr sbs sbu sby sca scb scc scr scs scu sr- sra srb src srr srs sry ss- ssa ssb ssc ssr sss ssu ssz sua sub suc sur sus suu suy suz sy- sya syb syc syr sys syu sza szr szu ua- uaa uab uac uar uas uau uay uaz uba ubb ubc ubr ubs ubu uby uca ucb ucc ucr ucs ucu ur- ura urb urc urr urs uru ury urz usa usb usc usr uss usu usz uua uuc uur uus uuu uyc uys uyu uza uzb uzu yaa yab yac yar yas yau yay yaz ybc ybr ybs yby ybz yca ycc ycs ycu ycy yra yrc yrs yru ysa ysb ysc ysr yss ysu ysy ysz yua yur yus yuu yuy yyb yyc yys yyu yyy yyz yzb yzr yzu yzy zaa zab zac zar zas zay zaz zbb zbc zbr zbs zby zcs zrs zsa zsu zsz zub zuc zur zus zuz zzr zzs zzy zzz