-al a-a a-b a-c aaa aab aac aad aae aak aal aau ab- aba abb abc abd abe abk abl abu ac- aca acb acc acd ace ack acl acu ad- ada adb adc add ade adk adl adu aea aeb aec aed aee aek ael aeu aka akb akc akd ake akk akl aku al- ala alb alc ald ale alk all alu au- aua aub auc aud aue auk aul b-u baa bab bac bad bae bak bal bau bba bbb bbc bbd bbe bbk bbl bbu bca bcb bcc bcd bce bck bcl bcu bda bdb bdc bdd bde bdk bdl bdu be- bea beb bec bed bee bek bel beu bka bkb bkc bke bkk bkl bla blb blc bld ble blk bll blu bua bub buc bud bue buk bul buu c-- caa cab cac cad cae cak cal cau cba cbb cbc cbd cbe cbk cbl cbu cca ccb ccc ccd cce cck ccl ccu cda cdb cdc cdd cde cdk cdl cdu ce- cea ceb cec ced cee cek cel ceu cka ckb ckc ckd cl- cla clb clc cld cle clk cll clu cua cub cuc cud cue cuk cul cuu daa dab dac dad dae dak dal dau dba dbb dbc dbd dbe dbk dbl dbu dca dcb dcc dcd dce dck dcl dcu dda ddb ddc ddd dde ddk ddl ddu de- dea deb dec ded dee dek del deu dka dkb dkc dke dkk dkl dku dl- dla dlb dlc dld dle dlk dll dlu dua dub duc dud due duk dul eaa eab eac ead eae eak eal eau eba ebb ebc ebd ebe ebk ebl ebu ec- eca ecb ecc ecd ece eck ecl ecu ed- eda edb edc edd ede edk edl edu eea eeb eec eed eee eek eel eka ekb ekc ekd eke ekl eku ela elb elc eld ele elk ell elu eu- eua eub euc eud eue eul ka- kaa kab kac kad kae kak kal kau kba kbb kbc kbd kbe kbk kbl kbu kca kcb kcc kcd kce kck kcl kcu kda kdb kdc kde kdk kdl kdu ke- kea keb kec ked kee kek kel kkb kkc kke kkk kkl kku kl- kla klb klc kld klu kub kuc kud kue kuk kul kuu la- laa lab lac lad lae lak lal lau lba lbb lbc lbd lbe lbk lbl lbu lca lcb lcc lcd lce lck lcl lcu lda ldb ldc ldd lde ldk ldl ldu lea leb lec led lee lek lel leu lka lkb lkl lla llb llc lld lle llk lll llu lua lub luc lud lue luk lul luu ua- uaa uab uac uad uae uak ual uau uba ubb ubc ube ubk ubl ubu uca ucb ucc ucd uce uck ucl ucu uda udb udc udd ude udk udl udu uea ueb uec ued uee uel uka ukb ukc uke ukk ukl uku ula ulb ulc uld ule ulk ull ulu uua uuc uue uuu