-al a-a a-b a-c aaa aab aac aae aak aal aau ab- aba abb abc abe abk abl abu ac- aca acb acc ace ack acl acu aea aeb aec aee aek ael aeu aka akb akc ake akk akl aku al- ala alb alc ale alk all alu au- aua aub auc aue auk aul b-u baa bab bac bae bak bal bau bba bbb bbc bbe bbk bbl bbu bca bcb bcc bce bck bcl bcu be- bea beb bec bee bek bel beu bka bkb bkc bke bkk bkl bla blb blc ble blk bll blu bua bub buc bue buk bul buu c-- caa cab cac cae cak cal cau cba cbb cbc cbe cbk cbl cbu cca ccb ccc cce cck ccl ccu ce- cea ceb cec cee cek cel ceu cka ckb ckc cl- cla clb clc cle clk cll clu cua cub cuc cue cuk cul cuu eaa eab eac eae eak eal eau eba ebb ebc ebe ebk ebl ebu ec- eca ecb ecc ece eck ecl ecu eea eeb eec eee eek eel eka ekb ekc eke ekl eku ela elb elc ele elk ell elu eu- eua eub euc eue eul ka- kaa kab kac kae kak kal kau kba kbb kbc kbe kbk kbl kbu kca kcb kcc kce kck kcl kcu ke- kea keb kec kee kek kel kkb kkc kke kkk kkl kku kl- kla klb klc klu kub kuc kue kuk kul kuu la- laa lab lac lae lak lal lau lba lbb lbc lbe lbk lbl lbu lca lcb lcc lce lck lcl lcu lea leb lec lee lek lel leu lka lkb lkl lla llb llc lle llk lll llu lua lub luc lue luk lul luu ua- uaa uab uac uae uak ual uau uba ubb ubc ube ubk ubl ubu uca ucb ucc uce uck ucl ucu uea ueb uec uee uel uka ukb ukc uke ukk ukl uku ula ulb ulc ule ulk ull ulu uua uuc uue uuu