a-a a-b a-t aaa aab aak aar aat aau ab- aba abb abk abr abt abu aka akb akk akr aku ar- ara arb ark arr art aru at- ata atb atr att atu au- aua aub auk aur aut b-u baa bab bak bar bat bau bba bbb bbk bbr bbt bbu bka bkb bkk bkr bkt bra brb brk brr brt bru bta btb btk btr btt btu bua bub buk bur but buu k-t ka- kaa kab kak kar kat kau kba kbb kbk kbr kbu kkb kkk kkr kkt kku kra krk krr krt kru kta ktb ktk ktr ktt ktu kub kuk kur kut kuu ra- raa rab rak rar rat rau rba rbb rbk rbr rbt rbu rkb rkk rkt rku rra rrb rrk rrr rrt rru rta rtb rtk rtr rtt rtu rua rub ruk rur rut ruu taa tab tak tar tat tau tba tbb tbk tbr tbt tbu tka tkb tkk tkr tkt tra trb trk trr trt tru tta ttb ttk ttr ttt ttu tua tub tuk tur tut tuu ua- uaa uab uak uar uat uau uba ubb ubk ubr ubt ubu uka ukb ukk ukr uku ur- ura urb urk urr urt uru uta utb utk utr utt utu uua uur uut uuu