-er a-a a-b a-c a-z aaa aab aac aae aao aar aau aav aaz ab- aba abb abc abe abo abr abu abv abz ac- aca acb acc ace aco acr acu acv acz aea aeb aec aee aeo aer aeu aev aez aoa aob aoc aoe aoo aor aou aov ar- ara arb arc are aro arr aru arv arz au- aua aub auc aue auo aur auv auz av- ava avb avc ave avo avr avu avz az- aza azb aze azo azu azz b-u baa bab bac bae bao bar bau bav baz bba bbb bbc bbe bbo bbr bbu bca bcb bcc bce bco bcr bcu bcv bcz be- bea beb bec bee beo ber beu bev bez boa bob boc boe boo bor bou bov boz bra brb bre bro brr bru brv brz bua bub buc bue buo bur buu buz bva bvb bvc bve bvo bvr bvu bvv bza bze bzo bzr bzu bzz c-- caa cab cac cae cao car cau cav caz cba cbb cbc cbe cbo cbr cbu cbv cbz cca ccb ccc cce cco ccr ccu ccv ccz ce- cea ceb cec cee ceo cer ceu cev cez co- coa cob coc coe coo cor cou cov coz cra crb crc cre cro crr cru crv crz cua cub cuc cue cuo cur cuu cuv cuz cva cvb cvc cve cvo cvr cvu cvv cvz cz- czc cze czo eaa eab eac eae eao ear eau eav eaz eba ebb ebc ebe ebo ebr ebu ebv ec- eca ecb ecc ece eco ecr ecu ecv eea eeb eec eee eeo eer eev eo- eoa eob eoc eoe eoo eor eou era erb erc ere ero err eru erv erz eu- eua eub euc eue eur euv eva evb evc eve evo evr evv eze ezo ezr ezz oaa oab oac oae oao oar oau oav ob- oba obb obc obe obo obr obu obv oc- oca ocb occ oco ocr ocu ocv ocz oea oeb oec oee oeo oer oo- ooa oob ooc ooo oor oov or- ora orb orc ore oro orr oru orv orz ou- oua ouc oue ouo our ov- ova ovb ovc ove ovo ovv oza oze ozo ozu ozz ra- raa rab rac rae rao rar rau rav raz rba rbb rbc rbe rbo rbr rbu rca rcb rcc rce rco rcr rcu rcv re- rea reb rec ree reo rer reu rev rez roa rob roc roe roo ror rou rov roz rra rrb rrc rrr rru rua rub ruc rue ruo rur ruu ruv ruz rva rvb rvc rve rvo rvr rvu rvv rza rzb rze rzo ua- uaa uab uac uae uao uar uau uav uaz uba ubb ubc ube ubo ubr ubu ubv uca ucb ucc uce uco ucr ucu ucv uea ueb uec uee uer uoa uob uoc uoe uoo uor ur- ura urb urc ure uro urr uru urz uua uuc uue uur uuu uva uvb uvc uve uvo uvu uvv uza uzb uzo uzu v-a v-e vaa vab vac vae vao var vau vav vaz vba vbc vbo vbr vbv vbz vca vcc vce vco vcr vcu vea veb vec vee veo ver veu vez voa vob voc voe voo vor vou vov voz vra vrb vrc vre vrr vru vue vur vuv vuz vva vvb vvc vvo vvr vvv vvz zaa zab zac zao zar zav zaz zbb zbc zbr zbv zce zco zea zeb zec zee zeo zer zev zez zo- zoa zob zoc zoe zoo zor zou zro zub zuc zur zuz zzr zzz