-er a-a a-b a-c a-t aaa aab aac aad aae aaf aao aar aas aat aau ab- aba abb abc abd abe abf abo abr abs abt abu ac- aca acb acc acd ace acf aco acr acs act acu ad- ada adb adc add ade adf ado adr ads adt adu aea aeb aec aed aee aef aeo aer aes aet aeu af- afa afb afc afd afe aff afo afr afs aft afu aoa aob aoc aod aoe aof aoo aor aos aot aou ar- ara arb arc ard are arf aro arr ars art aru as- asa asb asc asd ase asf aso asr ass ast asu at- ata atb atc atd ate atf ato atr ats att atu au- aua aub auc aud aue auf auo aur aus aut b-u baa bab bac bad bae baf bao bar bas bat bau bba bbb bbc bbd bbe bbf bbo bbr bbs bbt bbu bca bcb bcc bcd bce bcf bco bcr bcs bct bcu bda bdb bdc bdd bde bdf bdo bdr bds bdt bdu be- bea beb bec bed bee bef beo ber bes bet beu bfa bfb bfc bfd bfe bff bfo bfr bfs bft bfu boa bob boc bod boe bof boo bor bos bot bou bra brb brd bre brf bro brr brs brt bru bsa bsb bsc bsd bse bsf bso bsr bss bst bsu bta btb btc btd bte btf bto btr bts btt btu bua bub buc bud bue buf buo bur bus but buu c-- caa cab cac cad cae caf cao car cas cat cau cba cbb cbc cbd cbe cbf cbo cbr cbs cbt cbu cca ccb ccc ccd cce ccf cco ccr ccs cct ccu cda cdb cdc cdd cde cdf cdo cdr cds cdt cdu ce- cea ceb cec ced cee cef ceo cer ces cet ceu cfa cfb cfc cfd cfe cff cfo cfr cfs cft cfu co- coa cob coc cod coe cof coo cor cos cot cou cra crb crc crd cre crf cro crr crs crt cru csa csb csc csd cse csf cso csr css cst csu cta ctb ctc ctd cte ctf cto ctr cts ctt ctu cua cub cuc cud cue cuf cuo cur cus cut cuu daa dab dac dad dae daf dao dar das dat dau dba dbb dbc dbd dbe dbf dbo dbr dbs dbt dbu dca dcb dcc dcd dce dcf dco dcr dcs dct dcu dda ddb ddc ddd dde ddf ddo ddr dds ddt ddu de- dea deb dec ded dee def deo der des det deu dfa dfb dfc dfd dfe dff dfo dfr dfs dft dfu doa dob doc dod doe dof doo dor dos dot dou dra drb drc drd dre dro drr drs drt dru dsa dsb dsc dsd dse dsf dso dsr dss dst dsu dta dtb dtc dtd dte dtf dto dtr dts dtt dtu dua dub duc dud due duf duo dur dus dut eaa eab eac ead eae eaf eao ear eas eat eau eba ebb ebc ebd ebe ebf ebo ebr ebs ebt ebu ec- eca ecb ecc ecd ece ecf eco ecr ecs ect ecu ed- eda edb edc edd ede edf edo edr eds edt edu eea eeb eec eed eee eef eeo eer ees eet ef- efa efb efc efd efe eff efo efr efs eft eo- eoa eob eoc eod eoe eof eoo eor eos eot eou era erb erc erd ere erf ero err ers ert eru es- esa esb esc esd ese esf eso esr ess est esu eta etb etc etd ete etf eto etr ets ett etu eu- eua eub euc eud eue euf eur eus eut faa fab fac fad fae faf fao far fas fat fau fba fbb fbc fbd fbe fbf fbo fbr fbs fbt fbu fca fcb fcc fcd fce fcf fco fcr fcs fct fcu fda fdb fdc fdd fde fdf fdo fdr fds fdt fdu fea feb fec fed fee fef feo fer fes fet feu ffa ffc ffd ffe fff ffo ffr ffs fft ffu foa fob foc foe fof foo for fos fot fou fra frb frc frd fre frf fro frr frs frt fru fsa fsb fsc fsd fse fsf fso fsr fss fst fsu fta ftb ftc ftd fte ftf fto ftr fts ftt ftu fua fub fud fue fuf fuo fur fus fut fuu oaa oab oac oad oae oaf oao oar oas oat oau ob- oba obb obc obd obe obf obo obr obs obt obu oc- oca ocb occ ocd ocf oco ocr ocs oct ocu oda odb odc odd ode odf odo odr ods odt odu oea oeb oec oed oee oef oeo oer oes oet of- ofa ofb ofc ofd ofe off ofo ofr ofs oft ofu oo- ooa oob ooc ood oof ooo oor oos oot or- ora orb orc ord ore orf oro orr ors ort oru os- osa osb osc osd ose osf oso osr oss ost osu ot- ota otb otc otd ote otf oto otr ots ott otu ou- oua ouc oud oue ouf ouo our ous out ra- raa rab rac rad rae raf rao rar ras rat rau rba rbb rbc rbd rbe rbf rbo rbr rbs rbt rbu rca rcb rcc rcd rce rcf rco rcr rcs rct rcu rda rdb rdc rdd rde rdf rdo rdr rds rdt rdu re- rea reb rec red ree ref reo rer res ret reu rfa rfb rfc rfd rfe rff rfo rfr rfs rft rfu roa rob roc rod roe rof roo ror ros rot rou rra rrb rrc rrd rrf rrr rrs rrt rru rsa rsb rsc rsd rse rsf rso rsr rss rst rsu rta rtb rtc rtd rte rtf rto rtr rts rtt rtu rua rub ruc rud rue ruf ruo rur rus rut ruu saa sab sac sad sae saf sao sar sas sat sau sba sbb sbc sbd sbe