a-a a-b a-c aaa aab aac aam aau aay ab- aba abb abc abm abu aby ac- aca acb acc acm acu acy ama amb amc amm amu amy au- aua aub auc aum ay- aya ayc ayu b-u baa bab bac bam bau bay bba bbb bbc bbm bbu bby bca bcb bcc bcm bcu bcy bma bmb bmc bmm bmu bua bub buc bum buu buy by- bya byc bym byu c-- caa cab cac cam cau cay cba cbb cbc cbm cbu cby cca ccb ccc ccm ccu cma cmb cmc cmm cmu cmy cua cub cuc cum cuu cuy cya cyb cyc cym maa mab mac mam mau may mba mbb mbc mbm mbu mc- mca mcb mcc mcm mcu mma mmb mmc mmm mmu mua mub muc mum muu muy my- mya myb myc mym myu ua- uaa uab uac uam uau uay uba ubb ubc ubu uby uca ucb ucc ucm ucu um- uma umb umc umm umu uua uuc uum uuu uyc uyu yaa yab yac yam yau yay ybc ybm yby yca ycc ycu ycy yma ymc ymm yua yum yuu yuy yyb yyc yyu yyy