-er a-a a-b a-c a-t a-z aaa aab aac aae aak aar aat aau aaz ab- aba abb abc abe abk abr abt abu abz ac- aca acb acc ace ack acr act acu acz aea aeb aec aee aek aer aet aeu aez aka akb akc ake akk akr aku ar- ara arb arc are ark arr art aru arz at- ata atb atc ate atr att atu atz au- aua aub auc aue auk aur aut auz az- aza azb aze azt azu azz b-u baa bab bac bae bak bar bat bau baz bba bbb bbc bbe bbk bbr bbt bbu bca bcb bcc bce bck bcr bct bcu bcz be- bea beb bec bee bek ber bet beu bez bka bkb bkc bke bkk bkr bkt bra brb bre brk brr brt bru brz bta btb btc bte btk btr btt btu btz bua bub buc bue buk bur but buu buz bza bze bzr bzu bzz c-- caa cab cac cae cak car cat cau caz cba cbb cbc cbe cbk cbr cbt cbu cbz cca ccb ccc cce cck ccr cct ccu ccz ce- cea ceb cec cee cek cer cet ceu cez cka ckb ckc ckt cra crb crc cre crk crr crt cru crz cta ctb ctc cte ctk ctr ctt ctu ctz cua cub cuc cue cuk cur cut cuu cuz cz- czc cze czk czt eaa eab eac eae eak ear eat eau eaz eba ebb ebc ebe ebk ebr ebt ebu ec- eca ecb ecc ece eck ecr ect ecu eea eeb eec eee eek eer eet eka ekb ekc eke ekr ekt eku era erb erc ere erk err ert eru erz eta etb etc ete etk etr ett etu etz eu- eua eub euc eue eur eut eze ezr ezz k-t k-z ka- kaa kab kac kae kak kar kat kau kaz kba kbb kbc kbe kbk kbr kbu kbz kca kcb kcc kce kck kcr kct kcu ke- kea keb kec kee kek ker ket kez kkb kkc kke kkk kkr kkt kku kra krc krk krr krt kru kta ktb ktc kte ktk ktr ktt ktu kub kuc kue kuk kur kut kuu ra- raa rab rac rae rak rar rat rau raz rba rbb rbc rbe rbk rbr rbt rbu rca rcb rcc rce rcr rct rcu re- rea reb rec ree rek rer ret reu rez rkb rkc rke rkk rkt rku rkz rra rrb rrc rrk rrr rrt rru rta rtb rtc rte rtk rtr rtt rtu rtz rua rub ruc rue ruk rur rut ruu ruz rza rzb rze taa tab tac tae tak tar tat tau taz tba tbb tbc tbe tbk tbr tbt tbu tbz tca tcb tcc tce tck tcr tct tcu te- tea teb tec tee tek ter tet teu tez tka tkb tkc tke tkk tkr tkt tkz tra trb trc tre trk trr trt tru trz tta ttb ttc tte ttk ttr ttt ttu tua tub tuc tue tuk tur tut tuu tuz tza tze tzu ua- uaa uab uac uae uak uar uat uau uaz uba ubb ubc ube ubk ubr ubt ubu uca ucb ucc uce uck ucr uct ucu uea ueb uec uee uer uet uka ukb ukc uke ukk ukr uku ukz ur- ura urb urc ure urk urr urt uru urz uta utb utc ute utk utr utt utu utz uua uuc uue uur uut uuu uza uzb uzu zaa zab zac zak zar zat zaz zbb zbc zbr zbt zce zea zeb zec zee zek zer zet zez zka zta zte ztr zub zuc zuk zur zut zuz zzr zzt zzz