-al a-a a-b a-c aaa aab aac aad aae aal aau ab- aba abb abc abd abe abl abu ac- aca acb acc acd ace acl acu ad- ada adb adc add ade adl adu aea aeb aec aed aee ael aeu al- ala alb alc ald ale all alu au- aua aub auc aud aue aul b-u baa bab bac bad bae bal bau bba bbb bbc bbd bbe bbl bbu bca bcb bcc bcd bce bcl bcu bda bdb bdc bdd bde bdl bdu be- bea beb bec bed bee bel beu bla blb blc bld ble bll blu bua bub buc bud bue bul buu c-- caa cab cac cad cae cal cau cba cbb cbc cbd cbe cbl cbu cca ccb ccc ccd cce ccl ccu cda cdb cdc cdd cde cdl cdu ce- cea ceb cec ced cee cel ceu cl- cla clb clc cld cle cll clu cua cub cuc cud cue cul cuu daa dab dac dad dae dal dau dba dbb dbc dbd dbe dbl dbu dca dcb dcc dcd dce dcl dcu dda ddb ddc ddd dde ddl ddu de- dea deb dec ded dee del deu dl- dla dlb dlc dld dle dll dlu dua dub duc dud due dul eaa eab eac ead eae eal eau eba ebb ebc ebd ebe ebl ebu ec- eca ecb ecc ecd ece ecl ecu ed- eda edb edc edd ede edl edu eea eeb eec eed eee eel ela elb elc eld ele ell elu eu- eua eub euc eud eue eul la- laa lab lac lad lae lal lau lba lbb lbc lbd lbe lbl lbu lca lcb lcc lcd lce lcl lcu lda ldb ldc ldd lde ldl ldu lea leb lec led lee lel leu lla llb llc lld lle lll llu lua lub luc lud lue lul luu ua- uaa uab uac uad uae ual uau uba ubb ubc ube ubl ubu uca ucb ucc ucd uce ucl ucu uda udb udc udd ude udl udu uea ueb uec ued uee uel ula ulb ulc uld ule ull ulu uua uuc uue uuu