a-a a-b a-t aaa aab aam aao aat aau ab- aba abb abm abo abt abu ama amb amm amo amt amu aoa aob aom aoo aot aou at- ata atb atm ato att atu au- aua aub aum auo aut b-u baa bab bam bao bat bau bba bbb bbm bbo bbt bbu bma bmb bmm bmo bmt bmu boa bob bom boo bot bou bta btb btm bto btt btu bua bub bum buo but buu m-o maa mab mam mao mat mau mba mbb mbm mbo mbt mbu mma mmb mmm mmo mmt mmu moa mob mom moo mot mou mta mtb mtm mto mtt mtu mua mub mum mut muu oaa oab oam oao oat oau ob- oba obb obm obo obt obu om- oma omb omm omo omt omu oo- ooa oob oom ooo oot ot- ota otb otm oto ott otu ou- oua oum ouo out taa tab tam tao tat tau tba tbb tbm tbo tbt tbu tma tmb tmm tmo tmt tmu to- toa tob tom too tot tou tta ttb ttm tto ttt ttu tua tub tum tuo tut tuu ua- uaa uab uam uao uat uau uba ubb ubo ubt ubu um- uma umb umm umo umt umu uoa uob uom uoo uot uta utb utm uto utt utu uua uum uut uuu