-er a-a a-b a-c aaa aab aac aad aae aah aar aau ab- aba abb abc abd abe abh abr abu ac- aca acb acc acd ace ach acr acu ad- ada adb adc add ade adh adr adu aea aeb aec aed aee aeh aer aeu aha ahb ahc ahd ahe ahh ahr ahu ar- ara arb arc ard are arh arr aru au- aua aub auc aud aue auh aur b-u baa bab bac bad bae bah bar bau bba bbb bbc bbd bbe bbh bbr bbu bca bcb bcc bcd bce bch bcr bcu bda bdb bdc bdd bde bdh bdr bdu be- bea beb bec bed bee beh ber beu bha bhb bhc bhd bhe bhh bhr bhu bra brb brd bre brh brr bru bua bub buc bud bue buh bur buu c-- caa cab cac cad cae cah car cau cba cbb cbc cbd cbe cbh cbr cbu cca ccb ccc ccd cce cch ccr ccu cda cdb cdc cdd cde cdh cdr cdu ce- cea ceb cec ced cee ceh cer ceu ch- cha chb chc chd che chh chr chu cra crb crc crd cre crh crr cru cua cub cuc cud cue cuh cur cuu daa dab dac dad dae dah dar dau dba dbb dbc dbd dbe dbh dbr dbu dca dcb dcc dcd dce dcr dcu dda ddb ddc ddd dde ddh ddr ddu de- dea deb dec ded dee deh der deu dh- dha dhb dhc dhd dhe dhh dhr dhu dra drb drc drd dre drr dru dua dub duc dud due duh dur eaa eab eac ead eae eah ear eau eba ebb ebc ebd ebe ebh ebr ebu ec- eca ecb ecc ecd ece ech ecr ecu ed- eda edb edc edd ede edh edr edu eea eeb eec eed eee eer eha ehb ehc ehd ehe ehh ehr ehu era erb erc erd ere erh err eru eu- eua eub euc eud eue eur haa hab hac had hae hah har hau hba hbb hbc hbd hbe hbh hbr hbu hca hcb hcc hcd hce hch hcr hda hdb hdc hdd hde hdh hdr hdu he- hea heb hec hed hee heh her heu hha hhb hhc hhd hhe hhh hhr hhu hr- hra hrb hrc hrd hre hrh hrr hru hua hub huc hud hue huh hur huu ra- raa rab rac rad rae rah rar rau rba rbb rbc rbd rbe rbh rbr rbu rca rcb rcc rcd rce rch rcr rcu rda rdb rdc rdd rde rdh rdr rdu re- rea reb rec red ree reh rer reu rh- rha rhb rhc rhd rhe rhh rhr rhu rra rrb rrc rrd rrh rrr rru rua rub ruc rud rue ruh rur ruu ua- uaa uab uac uad uae uah uar uau uba ubb ubc ube ubh ubr ubu uca ucb ucc ucd uce uch ucr ucu uda udb udc udd ude udr udu uea ueb uec ued uee ueh uer uha uhb uhc uhd uhe uhh uhr uhu ur- ura urb urc urd ure urr uru uua uuc uue uur uuu