-er a-a a-b a-i aaa aab aad aae aai aan aao aar ab- aba abb abd abe abi abn abo abr ad- ada adb add ade adi adn ado adr aea aeb aed aee aei aen aeo aer ai- aia aib aid aie aii ain aio air an- ana anb and ane ani ann ano anr aoa aob aod aoe aoi aon aoo aor ar- ara arb ard are ari arn aro arr baa bab bad bae bai ban bao bar bba bbb bbd bbe bbi bbn bbo bbr bda bdb bdd bde bdi bdo bdr be- bea beb bed bee bei ben beo ber bi- bia bib bid bie bii bin bio bir bna bnb bnd bne bni bnn bno bnr boa bob bod boe boi bon boo bor bra brb brd bre bri brn bro brr daa dab dad dae dai dan dao dar dba dbb dbd dbe dbi dbn dbo dbr dda ddb ddd dde ddi ddn ddo ddr de- dea deb ded dee dei den deo der di- dia dib did die dii din dio dir dna dnb dnd dne dni dnn dno dnr doa dob dod doe doi don doo dor dra drb drd dre dri drn dro drr eaa eab ead eae eai ean eao ear eba ebb ebd ebe ebi ebn ebo ebr ed- eda edb edd ede edi edn edo edr eea eeb eed eee een eeo eer eia eib eid eie eii ein eio eir en- ena enb end ene eni enn eno enr eo- eoa eob eod eoe eoi eon eoo eor era erb erd ere eri ern ero err i-d ia- iaa iab iad iae iai ian iao iar iba ibb ibd ibe ibi ibn ibo ibr ida idb idd ide idi idn ido idr ie- iea ied iee iei ien ier iia iib iid iie iii iin iio iir in- ina inb ind ine ini inn ino inr io- ioa iob iod ioe ioi ion ioo ior ir- ira irb ird ire iri irn iro irr n-i naa nab nad nae nai nan nao nar nba nbb nbd nbe nbi nbn nbo nbr nda ndb ndd nde ndi ndn ndo ndr ne- nea neb ned nee nei nen neo ner nia nib nid nie nii nin nio nir nna nnb nne nni nnn nno no- noa nob nod noe noi non noo nor nra nrb nrd nre nri nrn nro nrr o-i oaa oab oad oae oai oan oao oar ob- oba obb obd obe obi obn obo obr oda odb odd ode odi odn odo odr oea oeb oed oee oei oen oeo oer oia oib oid oie oii oin oio oir on- ona onb ond one oni onn ono onr oo- ooa oob ood ooi oon ooo oor or- ora orb ord ore ori orn oro orr ra- raa rab rad rae rai ran rao rar rba rbb rbd rbe rbi rbn rbo rbr rda rdb rdd rde rdi rdn rdo rdr re- rea reb red ree rei ren reo rer ria rib rid rie rii rin rio rir rna rnb rnd rni rnn rno rnr roa rob rod roe roi ron roo ror rra rrb rrd rri rrn rrr