-er a-a a-b a-c aaa aab aac aae aaf aah aao aar ab- aba abb abc abe abf abh abo abr ac- aca acb acc ace acf ach aco acr aea aeb aec aee aef aeh aeo aer af- afa afb afc afe aff afh afo afr aha ahb ahc ahe ahf ahh aho ahr aoa aob aoc aoe aof aoh aoo aor ar- ara arb arc are arf arh aro arr baa bab bac bae baf bah bao bar bba bbb bbc bbe bbf bbh bbo bbr bca bcb bcc bce bcf bch bco bcr be- bea beb bec bee bef beh beo ber bfa bfb bfc bfe bff bfh bfo bfr bha bhb bhc bhe bhf bhh bho bhr boa bob boc boe bof boh boo bor bra brb bre brf brh bro brr c-- caa cab cac cae caf cah cao car cba cbb cbc cbe cbf cbh cbo cbr cca ccb ccc cce ccf cch cco ccr ce- cea ceb cec cee cef ceh ceo cer cfa cfb cfc cfe cff cfh cfo cfr ch- cha chb chc che chf chh cho chr co- coa cob coc coe cof coh coo cor cra crb crc cre crf crh cro crr eaa eab eac eae eaf eah eao ear eba ebb ebc ebe ebf ebh ebo ebr ec- eca ecb ecc ece ecf ech eco ecr eea eeb eec eee eef eeo eer ef- efa efb efc efe eff efh efo efr eha ehb ehc ehe ehf ehh eho ehr eo- eoa eob eoc eoe eof eoh eoo eor era erb erc ere erf erh ero err faa fab fac fae faf fah fao far fba fbb fbc fbe fbf fbh fbo fbr fca fcb fcc fce fcf fco fcr fea feb fec fee fef feh feo fer ffa ffc ffe fff ffh ffo ffr fha fhb fhc fhe fhf fhh fho fhr foa fob foc foe fof foh foo for fra frb frc fre frf frh fro frr haa hab hac hae haf hah hao har hba hbb hbc hbe hbf hbh hbo hbr hca hcb hcc hce hcf hch hco hcr he- hea heb hec hee hef heh heo her hfa hfb hfc hfe hff hfh hfo hfr hha hhb hhc hhe hhf hhh hho hhr hoa hob hoc hoe hof hoh hoo hor hr- hra hrb hrc hre hrf hrh hro hrr oaa oab oac oae oaf oah oao oar ob- oba obb obc obe obf obh obo obr oc- oca ocb occ ocf och oco ocr oea oeb oec oee oef oeh oeo oer of- ofa ofb ofc ofe off ofo ofr oha ohc ohe ohf ohh oho ohr oo- ooa oob ooc oof ooh ooo oor or- ora orb orc ore orf orh oro orr ra- raa rab rac rae raf rah rao rar rba rbb rbc rbe rbf rbh rbo rbr rca rcb rcc rce rcf rch rco rcr re- rea reb rec ree ref reh reo rer rfa rfb rfc rfe rff rfh rfo rfr rh- rha rhb rhc rhe rhf rhh rho rhr roa rob roc roe rof roh roo ror rra rrb rrc rrf rrh rrr

a-be a-ha aaaa aaab aaac aaae aaaf aaah aaar aaba aabb aabc aabh aaca aacb aacc aace aacf aach aaco aacr aaea aaec aafa aafb aafc aaff aaha aaoe aaoo aara aarc aare aaro abaa abab abac abae abaf abar abb- abba abbb abbe abbo abbr abca abcb abcc abcf abch abcr abec abee aber abff abha abho abhr aboa abob abof aboh aboo abor abra abrc abro acaa acab acac acae acar acba acca accc acce accf acch acco ace- acea acec aceh acer acfc acfe acha ache achh acho achr acoa acoe acoh acor acr- acra acrc acre acro acrr aeac aeaf aecb aeer aer- aera aerc aero afaa afao afar afca afcb afcc afch afee afer affa affc affo afoa afoe afoo afor afr- afra afrc afre afro ahab ahac ahah ahar ahfa ahha ahoa ahoe ahor ahra ahrc ahre ahrr aoah aoba aoca aoce aora aorb arab arac arae araf arah arar arba arbe arbh arc- arca arce arch arco area arec aree aref areh areo arfa arfb arfc arff arh- aroa arob aroe aroo aror arr- arra arrc arre arrh arro arrr baaa baaf baah baar baba babb babe babo babr bac- baca bacc bace bach baco baer bafc baff bafo baha baho bahr baoh bar- bara barb barc bare barf barh baro barr bbbb bbch bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcec bcer bcfc bche bcof bcor bcra beaf beah bear beba bebb bebe bebo beca bech beeb beef beer befa befe beff befo behr beo- beof beor bera berc bere bero berr bfca bhao bhar bhca bhcc bher bhff bhor bhra boab boac boar boba bobb bobe bobo boca boce boch boco boea boec boee boef boeo boer bofa bofe boff bofh boha boho bohr boob booc booe boof booh boor bor- bora bore borf borh boro borr brab brac brae braf brah brao brca brcb brce brea breb brec bree bref breo brer brfc broa brob broc broe broh broo bror brrr c-bo caaa caab caac caaf caah caba cabe cabf cabo cac- caca cacc cace cach caco cacr caec caer cafa cafb cafc cafe caff caha cahe caor cara carb carc care carf caro carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cbef cber cbfb cbfc cbha cbre cbrh ccaa ccab ccac ccaf ccar ccba ccbc ccca cccb cccc cccf ccee ccfa ccfc ccff ccha cche cchr ccob ccoc ccra ccrc ccre ccrf ceac cear ceba cec- ceca cece ceco ceeb ceec cef- cefa cefc ceor cer- cera cerc cere cerf cero cfaa cfab cfac cfae cfao cfar cfbc cfbr cfca cfcb cfcf cfco cffb cffr cfoa cfor cfra cfrb cfre chaa chab chac chae chaf chah chao char chca chce chch chea cheb chec chee chef cheh cher chfa chfc chfr chha choc choh choo chor chra