a-a a-b a-q a-t aaa aab aao aaq aar aat aau ab- aba abb abo abq abr abt abu aoa aob aoo aor aot aou aqa aqo aqr aqt ar- ara arb aro arq arr art aru at- ata atb ato atr att atu au- aua aub auo aur aut b-u baa bab bao baq bar bat bau bba bbb bbo bbq bbr bbt bbu boa bob boo boq bor bot bou bqt bra brb bro brq brr brt bru bta btb bto btq btr btt btu bua bub buo bur but buu oaa oab oao oaq oar oat oau ob- oba obb obo obr obt obu oo- ooa oob ooo oor oot oqb oqo or- ora orb oro orr ort oru ot- ota otb oto otr ott otu ou- oua ouo our out qaa qar qat qau qba qbq qoo qor qqq qqu qra qrb qrt qru qta qto qtq qtr qu- qua quo qur qut ra- raa rab rao raq rar rat rau rba rbb rbo rbr rbt rbu roa rob roo ror rot rou rra rrb rrq rrr rrt rru rta rtb rto rtq rtr rtt rtu rua rub ruo rur rut ruu taa tab tao taq tar tat tau tba tbb tbo tbr tbt tbu to- toa tob too toq tor tot tou tqo tra trb tro trq trr trt tru tta ttb tto ttr ttt ttu tua tub tuo tur tut tuu ua- uaa uab uao uaq uar uat uau uba ubb ubo ubr ubt ubu uoa uob uoo uor uot ur- ura urb uro urr urt uru uta utb uto utr utt utu uua uur uut uuu