a-a a-b a-c aaa aab aac aah aao aas aau aay ab- aba abb abc abh abo abs abu aby ac- aca acb acc ach aco acs acu acy aha ahb ahc ahh aho ahs ahu ahy aoa aob aoc aoh aoo aos aou as- asa asb asc ash aso ass asu asy au- aua aub auc auh auo aus ay- aya ayc ayh ayo ays ayu b-u baa bab bac bah bao bas bau bay bba bbb bbc bbh bbo bbs bbu bby bca bcb bcc bch bco bcs bcu bcy bha bhb bhc bhh bho bhs bhu boa bob boc boh boo bos bou boy bsa bsb bsc bsh bso bss bsu bsy bua bub buc buh buo bus buu buy by- bya byc byh byo bys byu c-- caa cab cac cah cao cas cau cay cba cbb cbc cbh cbo cbs cbu cby cca ccb ccc cch cco ccs ccu ch- cha chb chc chh cho chs chu chy co- coa cob coc coh coo cos cou coy csa csb csc csh cso css csu csy cua cub cuc cuh cuo cus cuu cuy cya cyb cyc cyo cys haa hab hac hah hao has hau hay hba hbb hbc hbh hbo hbs hbu hby hca hcb hcc hch hco hcs hcy hha hhb hhc hhh hho hhs hhu hhy hoa hob hoc hoh hoo hos hou hoy hsa hsb hsc hsh hss hsu hsy hua hub huc huh huo hus huu huy hy- hya hyb hyc hyh hyo hys hyy oaa oab oac oah oao oas oau ob- oba obb obc obh obo obs obu oby oc- oca ocb occ och oco ocs ocu oha ohc ohh oho ohs ohu oo- ooa oob ooc ooh ooo oos os- osa osb osc osh oso oss osu ou- oua ouc ouh ouo ous oya oyo oys saa sab sac sah sao sas sau say sba sbb sbc sbh sbo sbs sbu sby sca scb scc sch sco scs scu sh- sha shb shc shh sho shs shu shy soa sob soc soh soo sos sou soy ss- ssa ssb ssc ssh sso sss ssu sua sub suc suh suo sus suu suy sy- sya syb syc syh sys syu ua- uaa uab uac uah uao uas uau uay uba ubb ubc ubh ubo ubs ubu uby uca ucb ucc uch uco ucs ucu uha uhb uhc uhh uho uhs uhu uhy uoa uob uoc uoo uos usa usb usc ush uso uss usu uua uuc uus uuu uyc uyo uys uyu yaa yab yac yah yao yas yau yay ybc ybs yby yca ycc ych yco ycs ycu ycy yha yhc yhs yhu yob yoc yoo yos you yoy ysa ysb ysc yso yss ysu ysy yua yuh yuo yus yuu yuy yyb yyc yys yyu yyy