a-a a-b a-t a-z aaa aab aam aao aar aat aaz ab- aba abb abm abo abr abt abz ama amb amm amo amr amt amz aoa aob aom aoo aor aot ar- ara arb arm aro arr art arz at- ata atb atm ato atr att atz az- aza azb azm azo azt azz baa bab bam bao bar bat baz bba bbb bbm bbo bbr bbt bma bmb bmm bmo bmr bmt bmz boa bob bom boo bor bot boz bra brb brm bro brr brt brz bta btb btm bto btr btt btz bza bzo bzr bzz m-o m-r maa mab mam mao mar mat maz mba mbb mbm mbo mbr mbt mma mmb mmm mmo mmr mmt mmz moa mob mom moo mor mot moz mra mrb mrm mro mrr mrt mrz mta mtb mtm mto mtr mtt mza mzb mzm mzt oaa oab oam oao oar oat ob- oba obb obm obo obr obt om- oma omb omm omo omr omt omz oo- ooa oob oom ooo oor oot or- ora orb orm oro orr ort orz ot- ota otb otm oto otr ott otz oza ozm ozo ozt ozz ra- raa rab ram rao rar rat raz rba rbb rbm rbo rbr rbt rma rmb rmm rmo rmr rmt roa rob rom roo ror rot roz rra rrb rrm rrr rrt rta rtb rtm rto rtr rtt rtz rza rzb rzm rzo taa tab tam tao tar tat taz tba tbb tbm tbo tbr tbt tbz tma tmb tmm tmo tmr tmt tmz to- toa tob tom too tor tot toz tra trb trm tro trr trt trz tta ttb ttm tto ttr ttt tza zaa zab zam zao zar zat zaz zbb zbm zbr zbt zma zmb zmm zmt zo- zoa zob zom zoo zor zot zro zta ztm ztr zzr zzt zzz