-al a-a a-b a-c aaa aab aac aad aae aal aas aau ab- aba abb abc abd abe abl abs abu ac- aca acb acc acd ace acl acs acu ad- ada adb adc add ade adl ads adu aea aeb aec aed aee ael aes aeu al- ala alb alc ald ale all als alu as- asa asb asc asd ase asl ass asu au- aua aub auc aud aue aul aus b-u baa bab bac bad bae bal bas bau bba bbb bbc bbd bbe bbl bbs bbu bca bcb bcc bcd bce bcl bcs bcu bda bdb bdc bdd bde bdl bds bdu be- bea beb bec bed bee bel bes beu bla blb blc bld ble bll bls blu bsa bsb bsc bsd bse bsl bss bsu bua bub buc bud bue bul bus buu c-- caa cab cac cad cae cal cas cau cba cbb cbc cbd cbe cbl cbs cbu cca ccb ccc ccd cce ccl ccs ccu cda cdb cdc cdd cde cdl cds cdu ce- cea ceb cec ced cee cel ces ceu cl- cla clb clc cld cle cll cls clu csa csb csc csd cse csl css csu cua cub cuc cud cue cul cus cuu daa dab dac dad dae dal das dau dba dbb dbc dbd dbe dbl dbs dbu dca dcb dcc dcd dce dcl dcs dcu dda ddb ddc ddd dde ddl dds ddu de- dea deb dec ded dee del des deu dl- dla dlb dlc dld dle dll dls dlu dsa dsb dsc dsd dse dsl dss dsu dua dub duc dud due dul dus eaa eab eac ead eae eal eas eau eba ebb ebc ebd ebe ebl ebs ebu ec- eca ecb ecc ecd ece ecl ecs ecu ed- eda edb edc edd ede edl eds edu eea eeb eec eed eee eel ees ela elb elc eld ele ell els elu es- esa esb esc esd ese esl ess esu eu- eua eub euc eud eue eul eus la- laa lab lac lad lae lal las lau lba lbb lbc lbd lbe lbl lbs lbu lca lcb lcc lcd lce lcl lcs lcu lda ldb ldc ldd lde ldl lds ldu lea leb lec led lee lel les leu lla llb llc lld lle lll lls llu lsa lsb lsc lsd lse lsl lss lsu lua lub luc lud lue lul lus luu saa sab sac sad sae sal sas sau sba sbb sbc sbd sbe sbl sbs sbu sca scb scc scd sce scl scs scu sda sdb sdc sdd sde sdl sds sdu se- sea seb sec sed see sel ses seu sla slb slc sld sle sll sls slu ss- ssa ssb ssc ssd sse ssl sss ssu sua sub suc sud sue sul sus suu ua- uaa uab uac uad uae ual uas uau uba ubb ubc ube ubl ubs ubu uca ucb ucc ucd uce ucl ucs ucu uda udb udc udd ude udl uds udu uea ueb uec ued uee uel ues ula ulb ulc uld ule ull uls ulu usa usb usc usd use usl uss usu uua uuc uue uus uuu