a-a a-b aaa aab aad aak aar aay ab- aba abb abd abk abr aby ad- ada adb add adk adr ady aka akb akd akk akr ar- ara arb ard ark arr ary ay- aya ayd ayk ayr baa bab bad bak bar bay bba bbb bbd bbk bbr bby bda bdb bdd bdk bdr bdy bka bkb bkk bkr bra brb brd brk brr bry by- bya byd byk byr daa dab dad dak dar day dba dbb dbd dbk dbr dby dda ddb ddd ddk ddr ddy dka dkb dkk dkr dra drb drd drk drr dry dy- dya dyb dyd dyk dyr dyy ka- kaa kab kad kak kar kay kba kbb kbd kbk kbr kda kdb kdk kdr kdy kkb kkk kkr kky kra krd krk krr kry kya kyd kyr ra- raa rab rad rak rar ray rba rbb rbd rbk rbr rda rdb rdd rdr rdy rkb rkk rky rra rrb rrd rrk rrr ry- rya ryd ryk ryr ryy yaa yab yad yak yar yay ybr yby yda ydy yka ykk yra yyb yyy