-er a-a a-b a-c aaa aab aac aad aae aaf aam aao aar ab- aba abb abc abd abe abf abm abo abr ac- aca acb acc acd ace acf acm aco acr ad- ada adb adc add ade adf adm ado adr aea aeb aec aed aee aef aem aeo aer af- afa afb afc afd afe aff afm afo afr ama amb amc amd ame amf amm amo amr aoa aob aoc aod aoe aof aom aoo aor ar- ara arb arc ard are arf arm aro arr baa bab bac bad bae baf bam bao bar bba bbb bbc bbd bbe bbf bbm bbo bbr bca bcb bcc bcd bce bcf bcm bco bcr bda bdb bdc bdd bde bdf bdm bdo bdr be- bea beb bec bed bee bef bem beo ber bfa bfb bfc bfd bfe bff bfm bfo bfr bma bmb bmc bmd bme bmf bmm bmo bmr boa bob boc bod boe bof bom boo bor bra brb brd bre brf brm bro brr c-- caa cab cac cad cae caf cam cao car cba cbb cbc cbd cbe cbf cbm cbo cbr cca ccb ccc ccd cce ccf ccm cco ccr cda cdb cdc cdd cde cdf cdm cdo cdr ce- cea ceb cec ced cee cef cem ceo cer cfa cfb cfc cfd cfe cff cfm cfo cfr cma cmb cmc cmd cme cmf cmm cmo cmr co- coa cob coc cod coe cof com coo cor cra crb crc crd cre crf crm cro crr daa dab dac dad dae daf dam dao dar dba dbb dbc dbd dbe dbf dbm dbo dbr dca dcb dcc dcd dce dcf dcm dco dcr dda ddb ddc ddd dde ddf ddm ddo ddr de- dea deb dec ded dee def dem deo der dfa dfb dfc dfd dfe dff dfm dfo dfr dma dmb dmc dmd dme dmf dmm dmo dmr doa dob doc dod doe dof dom doo dor dra drb drc drd dre drm dro drr eaa eab eac ead eae eaf eam eao ear eba ebb ebc ebd ebe ebf ebm ebo ebr ec- eca ecb ecc ecd ece ecf ecm eco ecr ed- eda edb edc edd ede edf edm edo edr eea eeb eec eed eee eef eem eeo eer ef- efa efb efc efd efe eff efm efo efr em- ema emb emc emd eme emf emm emo emr eo- eoa eob eoc eod eoe eof eom eoo eor era erb erc erd ere erf erm ero err faa fab fac fad fae faf fam fao far fba fbb fbc fbd fbe fbf fbm fbo fbr fca fcb fcc fcd fce fcf fcm fco fcr fda fdb fdc fdd fde fdf fdm fdo fdr fea feb fec fed fee fef fem feo fer ffa ffc ffd ffe fff ffm ffo ffr fma fmb fmc fmd fme fmf fmm fmo fmr foa fob foc foe fof fom foo for fra frb frc frd fre frf frm fro frr m-f m-o m-r maa mab mac mad mae maf mam mao mar mba mbb mbc mbd mbe mbf mbm mbo mbr mc- mca mcb mcc mcd mce mcf mcm mco mcr mda mdb mdc mdd mde mdf mdm mdo mdr mea meb mec med mee mef mem meo mer mfa mfb mfc mfd mfe mff mfm mfo mfr mma mmb mmc mmd mme mmf mmm mmo mmr moa mob moc mod moe mof mom moo mor mra mrb mrc mrd mre mrf mrm mro mrr oaa oab oac oad oae oaf oam oao oar ob- oba obb obc obd obe obf obm obo obr oc- oca ocb occ ocd ocf ocm oco ocr oda odb odc odd ode odf odm odo odr oea oeb oec oed oee oef oem oeo oer of- ofa ofb ofc ofd ofe off ofm ofo ofr om- oma omb omc omd ome omf omm omo omr oo- ooa oob ooc ood oof oom ooo oor or- ora orb orc ord ore orf orm oro orr ra- raa rab rac rad rae raf ram rao rar rba rbb rbc rbd rbe rbf rbm rbo rbr rca rcb rcc rcd rce rcf rcm rco rcr rda rdb rdc rdd rde rdf rdm rdo rdr re- rea reb rec red ree ref rem reo rer rfa rfb rfc rfd rfe rff rfm rfo rfr rma rmb rmc rmd rme rmf rmm rmo rmr roa rob roc rod roe rof rom roo ror rra rrb rrc rrd rrf rrm rrr

a-be a-do aaaa aaab aaac aaad aaae aaaf aaam aaar aaba aabb aabc aabd aabm aaca aacb aacc aacd aace aacf aacm aaco aacr aada aadc aade aaea aaec aaem aafa aafb aafc aafd aaff aama aamb aamc aamd aame aamo aamr aaoe aaoo aara aarc aard aare aarm aaro abaa abab abac abad abae abaf abam abar abb- abba abbb abbe abbo abbr abca abcb abcc abcd abcf abcr abda abdo abec abed abee aber abff abma abmb abmc aboa abob abod abof aboo abor abra abrc abro acaa acab acac acad acae acar acba acca accc accd acce accf accm acco acda acdb acdc acde acdf acdm ace- acea acec aced acem acer acfc acfd acfe acfm acma acmc acme acmf acoa acod acoe acom acor acr- acra acrc acre acrm acro acrr adaa adab adac adad adae adam adao adar adba adbc adcc adda addc addd adde addo addr adea adeb adee adem adeo ader adfa adfc adma admb adme admr adob adoc adod adoe adoo ador adra adre adro aeac aeaf aecb aede aeer aeom aer- aera aerc aerd aero afaa afad afam afao afar afca afcb afcc afdb afdc afee afer affa affc affo afma afmc afoa afoe afoo afor afr- afra afrc afre afrm afro amaa amac amad amae amam amar amb- amba ambe ambo ambr amca amcc amco amda amdo amec amed amee amer amfm amfr amm- amma amme ammo amob amoc amod amof amoo amor amra amrc amro aoba aoca