a-a a-b aaa aab aaj aao aar aau ab- aba abb abj abo abr abu aja ajb ajj ajo ajr aju aoa aob aoj aoo aor aou ar- ara arb arj aro arr aru au- aua aub auj auo aur b-u baa bab baj bao bar bau bba bbb bbo bbr bbu bja bjj bjr bju boa bob boj boo bor bou bra brb brj bro brr bru bua bub buj buo bur buu jaa jab jaj jao jar jau jba jbj jbo jbr jbu jja jjb jjj jjr jju joa job joj joo jor jou jra jrb jro jrr jub juo jur oaa oab oaj oao oar oau ob- oba obb obj obo obr obu oja ojb ojo oju oo- ooa oob ooo oor or- ora orb oro orr oru ou- oua ouo our ra- raa rab raj rao rar rau rba rbb rbo rbr rbu rja rjr roa rob roj roo ror rou rra rrb rrr rru rua rub ruo rur ruu ua- uaa uab uaj uao uar uau uba ubb ubo ubr ubu ujo uoa uob uoj uoo uor ur- ura urb uro urr uru uua uur uuu