-al -er a-a a-b a-c aaa aab aac aad aae aal aar aau ab- aba abb abc abd abe abl abr abu ac- aca acb acc acd ace acl acr acu ad- ada adb adc add ade adl adr adu aea aeb aec aed aee ael aer aeu al- ala alb alc ald ale all alr alu ar- ara arb arc ard are arl arr aru au- aua aub auc aud aue aul aur b-u baa bab bac bad bae bal bar bau bba bbb bbc bbd bbe bbl bbr bbu bca bcb bcc bcd bce bcl bcr bcu bda bdb bdc bdd bde bdl bdr bdu be- bea beb bec bed bee bel ber beu bla blb blc bld ble bll blr blu bra brb brd bre brl brr bru bua bub buc bud bue bul bur buu c-- caa cab cac cad cae cal car cau cba cbb cbc cbd cbe cbl cbr cbu cca ccb ccc ccd cce ccl ccr ccu cda cdb cdc cdd cde cdl cdr cdu ce- cea ceb cec ced cee cel cer ceu cl- cla clb clc cld cle cll clr clu cra crb crc crd cre crl crr cru cua cub cuc cud cue cul cur cuu daa dab dac dad dae dal dar dau dba dbb dbc dbd dbe dbl dbr dbu dca dcb dcc dcd dce dcl dcr dcu dda ddb ddc ddd dde ddl ddr ddu de- dea deb dec ded dee del der deu dl- dla dlb dlc dld dle dll dlr dlu dra drb drc drd dre drl drr dru dua dub duc dud due dul dur eaa eab eac ead eae eal ear eau eba ebb ebc ebd ebe ebl ebr ebu ec- eca ecb ecc ecd ece ecl ecr ecu ed- eda edb edc edd ede edl edr edu eea eeb eec eed eee eel eer ela elb elc eld ele ell elr elu era erb erc erd ere erl err eru eu- eua eub euc eud eue eul eur la- laa lab lac lad lae lal lar lau lba lbb lbc lbd lbe lbl lbr lbu lca lcb lcc lcd lce lcl lcr lcu lda ldb ldc ldd lde ldl ldr ldu lea leb lec led lee lel ler leu lla llb llc lld lle lll llr llu lra lrb lrc lrd lrr lru lua lub luc lud lue lul lur luu ra- raa rab rac rad rae ral rar rau rba rbb rbc rbd rbe rbl rbr rbu rca rcb rcc rcd rce rcl rcr rcu rda rdb rdc rdd rde rdl rdr rdu re- rea reb rec red ree rel rer reu rla rlc rld rle rll rlr rlu rra rrb rrc rrd rrl rrr rru rua rub ruc rud rue rur ruu ua- uaa uab uac uad uae ual uar uau uba ubb ubc ube ubl ubr ubu uca ucb ucc ucd uce ucl ucr ucu uda udb udc udd ude udl udr udu uea ueb uec ued uee uel uer ula ulb ulc uld ule ull ulr ulu ur- ura urb urc urd ure url urr uru uua uuc uue uur uuu