-er a-a a-b a-c aaa aab aac aad aae aah aao aar aau ab- aba abb abc abd abe abh abo abr abu ac- aca acb acc acd ace ach aco acr acu ad- ada adb adc add ade adh ado adr adu aea aeb aec aed aee aeh aeo aer aeu aha ahb ahc ahd ahe ahh aho ahr ahu aoa aob aoc aod aoe aoh aoo aor aou ar- ara arb arc ard are arh aro arr aru au- aua aub auc aud aue auh auo aur b-u baa bab bac bad bae bah bao bar bau bba bbb bbc bbd bbe bbh bbo bbr bbu bca bcb bcc bcd bce bch bco bcr bcu bda bdb bdc bdd bde bdh bdo bdr bdu be- bea beb bec bed bee beh beo ber beu bha bhb bhc bhd bhe bhh bho bhr bhu boa bob boc bod boe boh boo bor bou bra brb brd bre brh bro brr bru bua bub buc bud bue buh buo bur buu c-- caa cab cac cad cae cah cao car cau cba cbb cbc cbd cbe cbh cbo cbr cbu cca ccb ccc ccd cce cch cco ccr ccu cda cdb cdc cdd cde cdh cdo cdr cdu ce- cea ceb cec ced cee ceh ceo cer ceu ch- cha chb chc chd che chh cho chr chu co- coa cob coc cod coe coh coo cor cou cra crb crc crd cre crh cro crr cru cua cub cuc cud cue cuh cuo cur cuu daa dab dac dad dae dah dao dar dau dba dbb dbc dbd dbe dbh dbo dbr dbu dca dcb dcc dcd dce dco dcr dcu dda ddb ddc ddd dde ddh ddo ddr ddu de- dea deb dec ded dee deh deo der deu dh- dha dhb dhc dhd dhe dhh dho dhr dhu doa dob doc dod doe doh doo dor dou dra drb drc drd dre dro drr dru dua dub duc dud due duh duo dur eaa eab eac ead eae eah eao ear eau eba ebb ebc ebd ebe ebh ebo ebr ebu ec- eca ecb ecc ecd ece ech eco ecr ecu ed- eda edb edc edd ede edh edo edr edu eea eeb eec eed eee eeo eer eha ehb ehc ehd ehe ehh eho ehr ehu eo- eoa eob eoc eod eoe eoh eoo eor eou era erb erc erd ere erh ero err eru eu- eua eub euc eud eue eur haa hab hac had hae hah hao har hau hba hbb hbc hbd hbe hbh hbo hbr hbu hca hcb hcc hcd hce hch hco hcr hda hdb hdc hdd hde hdh hdo hdr hdu he- hea heb hec hed hee heh heo her heu hha hhb hhc hhd hhe hhh hho hhr hhu hoa hob hoc hod hoe hoh hoo hor hou hr- hra hrb hrc hrd hre hrh hro hrr hru hua hub huc hud hue huh huo hur huu oaa oab oac oad oae oah oao oar oau ob- oba obb obc obd obe obh obo obr obu oc- oca ocb occ ocd och oco ocr ocu oda odb odc odd ode odh odo odr odu oea oeb oec oed oee oeh oeo oer oha ohc ohd ohe ohh oho ohr ohu oo- ooa oob ooc ood ooh ooo oor or- ora orb orc ord ore orh oro orr oru ou- oua ouc oud oue ouh ouo our ra- raa rab rac rad rae rah rao rar rau rba rbb rbc rbd rbe rbh rbo rbr rbu rca rcb rcc rcd rce rch rco rcr rcu rda rdb rdc rdd rde rdh rdo rdr rdu re- rea reb rec red ree reh reo rer reu rh- rha rhb rhc rhd rhe rhh rho rhr rhu roa rob roc rod roe roh roo ror rou rra rrb rrc rrd rrh rrr rru rua rub ruc rud rue ruh ruo rur ruu ua- uaa uab uac uad uae uah uao uar uau uba ubb ubc ube ubh ubo ubr ubu uca ucb ucc ucd uce uch uco ucr ucu uda udb udc udd ude udo udr udu uea ueb uec ued uee ueh uer uha uhb uhc uhd uhe uhh uho uhr uhu uoa uob uoc uod uoe uoo uor ur- ura urb urc urd ure uro urr uru uua uuc uue uur uuu