a-a a-b a-t aaa aab aam aao aar aat aau ab- aba abb abm abo abr abt abu ama amb amm amo amr amt amu aoa aob aom aoo aor aot aou ar- ara arb arm aro arr art aru at- ata atb atm ato atr att atu au- aua aub aum auo aur aut b-u baa bab bam bao bar bat bau bba bbb bbm bbo bbr bbt bbu bma bmb bmm bmo bmr bmt bmu boa bob bom boo bor bot bou bra brb brm bro brr brt bru bta btb btm bto btr btt btu bua bub bum buo bur but buu m-o m-r maa mab mam mao mar mat mau mba mbb mbm mbo mbr mbt mbu mma mmb mmm mmo mmr mmt mmu moa mob mom moo mor mot mou mra mrb mrm mro mrr mrt mru mta mtb mtm mto mtr mtt mtu mua mub mum mur mut muu oaa oab oam oao oar oat oau ob- oba obb obm obo obr obt obu om- oma omb omm omo omr omt omu oo- ooa oob oom ooo oor oot or- ora orb orm oro orr ort oru ot- ota otb otm oto otr ott otu ou- oua oum ouo our out ra- raa rab ram rao rar rat rau rba rbb rbm rbo rbr rbt rbu rma rmb rmm rmo rmr rmt roa rob rom roo ror rot rou rra rrb rrm rrr rrt rru rta rtb rtm rto rtr rtt rtu rua rub rum ruo rur rut ruu taa tab tam tao tar tat tau tba tbb tbm tbo tbr tbt tbu tma tmb tmm tmo tmr tmt tmu to- toa tob tom too tor tot tou tra trb trm tro trr trt tru tta ttb ttm tto ttr ttt ttu tua tub tum tuo tur tut tuu ua- uaa uab uam uao uar uat uau uba ubb ubo ubr ubt ubu um- uma umb umm umo umr umt umu uoa uob uom uoo uor uot ur- ura urb urm uro urr urt uru uta utb utm uto utr utt utu uua uum uur uut uuu