-er a-a a-b a-c aaa aab aac aae aaj aak aar aau ab- aba abb abc abe abj abk abr abu ac- aca acb acc ace acj ack acr acu aea aeb aec aee aej aek aer aeu aja ajb ajc aje ajj ajk ajr aju aka akb akc ake akj akk akr aku ar- ara arb arc are arj ark arr aru au- aua aub auc aue auj auk aur b-u baa bab bac bae baj bak bar bau bba bbb bbc bbe bbk bbr bbu bca bcb bcc bce bcj bck bcr bcu be- bea beb bec bee bek ber beu bja bjc bjj bjk bjr bju bka bkb bkc bke bkk bkr bra brb bre brj brk brr bru bua bub buc bue buj buk bur buu c-- c-j caa cab cac cae caj cak car cau cba cbb cbc cbe cbj cbk cbr cbu cca ccb ccc cce ccj cck ccr ccu ce- cea ceb cec cee cej cek cer ceu cja cjb cjc cjk cjr cka ckb ckc cra crb crc cre crj crk crr cru cua cub cuc cue cuk cur cuu eaa eab eac eae eaj eak ear eau eba ebb ebc ebe ebj ebk ebr ebu ec- eca ecb ecc ece ecj eck ecr ecu eea eeb eec eee eek eer eja ejc eju eka ekb ekc eke ekr eku era erb erc ere erk err eru eu- eua eub euc eue euj eur jaa jab jac jae jaj jak jar jau jba jbc jbj jbk jbr jbu jca jcb jcc jce jck jcr jcu jea jeb jec jee jej jek jer jeu jja jjb jjc jjj jjk jjr jju jka jkb jkk jkr jku jra jrb jrc jrk jrr jub jue juk jur ka- kaa kab kac kae kaj kak kar kau kba kbb kbc kbe kbk kbr kbu kca kcb kcc kce kck kcr kcu ke- kea keb kec kee kek ker kjb kjc kje kjr kju kkb kkc kke kkk kkr kku kra krc krk krr kru kub kuc kue kuj kuk kur kuu ra- raa rab rac rae raj rak rar rau rba rbb rbc rbe rbk rbr rbu rca rcb rcc rce rcj rcr rcu re- rea reb rec ree rek rer reu rja rjc rjk rjr rkb rkc rke rkk rku rra rrb rrc rrk rrr rru rua rub ruc rue ruk rur ruu ua- uaa uab uac uae uaj uak uar uau uba ubb ubc ube ubk ubr ubu uca ucb ucc uce ucj uck ucr ucu uea ueb uec uee uer ujc uka ukb ukc uke ukk ukr uku ur- ura urb urc ure urk urr uru uua uuc uue uur uuu