a-a a-b aaa aab aaj aak aao aar aau ab- aba abb abj abk abo abr abu aja ajb ajj ajk ajo ajr aju aka akb akj akk ako akr aku aoa aob aoj aok aoo aor aou ar- ara arb arj ark aro arr aru au- aua aub auj auk auo aur b-u baa bab baj bak bao bar bau bba bbb bbk bbo bbr bbu bja bjj bjk bjr bju bka bkb bkk bko bkr boa bob boj bok boo bor bou bra brb brj brk bro brr bru bua bub buj buk buo bur buu jaa jab jaj jak jao jar jau jba jbj jbk jbo jbr jbu jja jjb jjj jjk jjr jju jka jkb jkk jko jkr jku joa job joj jok joo jor jou jra jrb jrk jro jrr jub juk juo jur ka- kaa kab kaj kak kao kar kau kba kbb kbk kbo kbr kbu kjb kjr kju kkb kkk kkr kku koa kob kok koo kor kou kra krk kro krr kru kub kuj kuk kur kuu oaa oab oaj oak oao oar oau ob- oba obb obj obk obo obr obu oja ojb ojo oju oka okb okj okk oko okr oku oo- ooa oob ook ooo oor or- ora orb ork oro orr oru ou- oua ouk ouo our ra- raa rab raj rak rao rar rau rba rbb rbk rbo rbr rbu rja rjk rjr rkb rkk rko rku roa rob roj rok roo ror rou rra rrb rrk rrr rru rua rub ruk ruo rur ruu ua- uaa uab uaj uak uao uar uau uba ubb ubk ubo ubr ubu ujo uka ukb ukk ukr uku uoa uob uoj uok uoo uor ur- ura urb urk uro urr uru uua uur uuu