a-a a-b a-t a-z aaa aab aan aao aar aat aaz ab- aba abb abn abo abr abt abz an- ana anb ann ano anr ant anz aoa aob aon aoo aor aot ar- ara arb arn aro arr art arz at- ata atb atn ato atr att atz az- aza azb azn azo azt azz baa bab ban bao bar bat baz bba bbb bbn bbo bbr bbt bna bnb bnn bno bnr bnt bnz boa bob bon boo bor bot boz bra brb brn bro brr brt brz bta btb btn bto btr btt btz bza bzn bzo bzr bzz naa nab nan nao nar nat naz nba nbb nbn nbo nbr nbt nna nnb nnn nno nnt nnz no- noa nob non noo nor not noz nra nrb nrn nro nrr nrt nrz nta ntb ntn nto ntr ntt ntz nzb nzo nzz oaa oab oan oao oar oat ob- oba obb obn obo obr obt on- ona onb onn ono onr ont oo- ooa oob oon ooo oor oot or- ora orb orn oro orr ort orz ot- ota otb otn oto otr ott otz oza ozo ozt ozz ra- raa rab ran rao rar rat raz rba rbb rbn rbo rbr rbt rna rnb rnn rno rnr rnt rnz roa rob ron roo ror rot roz rra rrb rrn rrr rrt rta rtb rtn rto rtr rtt rtz rza rzb rzo taa tab tan tao tar tat taz tba tbb tbn tbo tbr tbt tbz tna tnb tnn tno tnr tnt tnz to- toa tob ton too tor tot toz tra trb trn tro trr trt trz tta ttb ttn tto ttr ttt tza zaa zab zan zao zar zat zaz zbb zbr zbt znn zno zo- zoa zob zon zoo zor zot zro zta ztr zzr zzt zzz