a-a a-b a-t aaa aab aak aar aat aay ab- aba abb abk abr abt aby aka akb akk akr ar- ara arb ark arr art ary at- ata atb atr att ay- aya ayk ayr ayt baa bab bak bar bat bay bba bbb bbk bbr bbt bby bka bkb bkk bkr bkt bra brb brk brr brt bry bta btb btk btr btt bty by- bya byk byr byt k-t ka- kaa kab kak kar kat kay kba kbb kbk kbr kkb kkk kkr kkt kky kra krk krr krt kry kta ktb ktk ktr ktt kya kyr kyt ra- raa rab rak rar rat ray rba rbb rbk rbr rbt rkb rkk rkt rky rra rrb rrk rrr rrt rta rtb rtk rtr rtt rty ry- rya ryk ryr ryy taa tab tak tar tat tay tba tbb tbk tbr tbt tka tkb tkk tkr tkt tky tra trb trk trr trt try tta ttb ttk ttr ttt tty tya tyr tyt yaa yab yak yar yat yay ybr yby yka ykk yra yrt yta ytk ytr ytt yyb yyt yyy