-al a-a a-b a-c aaa aab aac aad aae aaf aal aau ab- aba abb abc abd abe abf abl abu ac- aca acb acc acd ace acf acl acu ad- ada adb adc add ade adf adl adu aea aeb aec aed aee aef ael aeu af- afa afb afc afd afe aff afl afu al- ala alb alc ald ale alf all alu au- aua aub auc aud aue auf aul b-u baa bab bac bad bae baf bal bau bba bbb bbc bbd bbe bbf bbl bbu bca bcb bcc bcd bce bcf bcl bcu bda bdb bdc bdd bde bdf bdl bdu be- bea beb bec bed bee bef bel beu bfa bfb bfc bfd bfe bff bfl bfu bla blb blc bld ble blf bll blu bua bub buc bud bue buf bul buu c-- caa cab cac cad cae caf cal cau cba cbb cbc cbd cbe cbf cbl cbu cca ccb ccc ccd cce ccf ccl ccu cda cdb cdc cdd cde cdf cdl cdu ce- cea ceb cec ced cee cef cel ceu cfa cfb cfc cfd cfe cff cfl cfu cl- cla clb clc cld cle clf cll clu cua cub cuc cud cue cuf cul cuu daa dab dac dad dae daf dal dau dba dbb dbc dbd dbe dbf dbl dbu dca dcb dcc dcd dce dcf dcl dcu dda ddb ddc ddd dde ddf ddl ddu de- dea deb dec ded dee def del deu dfa dfb dfc dfd dfe dff dfl dfu dl- dla dlb dlc dld dle dlf dll dlu dua dub duc dud due duf dul eaa eab eac ead eae eaf eal eau eba ebb ebc ebd ebe ebf ebl ebu ec- eca ecb ecc ecd ece ecf ecl ecu ed- eda edb edc edd ede edf edl edu eea eeb eec eed eee eef eel ef- efa efb efc efd efe eff efl ela elb elc eld ele elf ell elu eu- eua eub euc eud eue euf eul faa fab fac fad fae faf fal fau fba fbb fbc fbd fbe fbf fbl fbu fca fcb fcc fcd fce fcf fcl fcu fda fdb fdc fdd fde fdf fdl fdu fea feb fec fed fee fef fel feu ffa ffc ffd ffe fff ffl ffu fla flb flc fld fle flf fll flu fua fub fud fue fuf ful fuu la- laa lab lac lad lae laf lal lau lba lbb lbc lbd lbe lbf lbl lbu lca lcb lcc lcd lce lcf lcl lcu lda ldb ldc ldd lde ldf ldl ldu lea leb lec led lee lef lel leu lfa lfb lfc lfd lfe lff lfl lfu lla llb llc lld lle llf lll llu lua lub luc lud lue luf lul luu ua- uaa uab uac uad uae uaf ual uau uba ubb ubc ube ubf ubl ubu uca ucb ucc ucd uce ucf ucl ucu uda udb udc udd ude udf udl udu uea ueb uec ued uee uef uel ufa ufc ufd ufe uff ufl ufu ula ulb ulc uld ule ulf ull ulu uua uuc uue uuu