-er a-a a-b a-i aaa aab aad aae aah aai aao aar ab- aba abb abd abe abh abi abo abr ad- ada adb add ade adh adi ado adr aea aeb aed aee aeh aei aeo aer aha ahb ahd ahe ahh ahi aho ahr ai- aia aib aid aie aih aii aio air aoa aob aod aoe aoh aoi aoo aor ar- ara arb ard are arh ari aro arr baa bab bad bae bah bai bao bar bba bbb bbd bbe bbh bbi bbo bbr bda bdb bdd bde bdh bdi bdo bdr be- bea beb bed bee beh bei beo ber bha bhb bhd bhe bhh bhi bho bhr bi- bia bib bid bie bih bii bio bir boa bob bod boe boh boi boo bor bra brb brd bre brh bri bro brr daa dab dad dae dah dai dao dar dba dbb dbd dbe dbh dbi dbo dbr dda ddb ddd dde ddh ddi ddo ddr de- dea deb ded dee deh dei deo der dh- dha dhb dhd dhe dhh dhi dho dhr di- dia dib did die dih dii dio dir doa dob dod doe doh doi doo dor dra drb drd dre dri dro drr eaa eab ead eae eah eai eao ear eba ebb ebd ebe ebh ebi ebo ebr ed- eda edb edd ede edh edi edo edr eea eeb eed eee eeo eer eha ehb ehd ehe ehh ehi eho ehr eia eib eid eie eii eio eir eo- eoa eob eod eoe eoh eoi eoo eor era erb erd ere erh eri ero err h-i haa hab had hae hah hai hao har hba hbb hbd hbe hbh hbi hbo hbr hda hdb hdd hde hdh hdi hdo hdr he- hea heb hed hee heh hei heo her hha hhb hhd hhe hhh hhi hho hhr hia hib hid hie hih hii hio hir hoa hob hod hoe hoh hoi hoo hor hr- hra hrb hrd hre hrh hri hro hrr i-d ia- iaa iab iad iae iah iai iao iar iba ibb ibd ibe ibh ibi ibo ibr ida idb idd ide idh idi ido idr ie- iea ied iee iei ier iha ihb ihd ihe ihh ihi iho ihr iia iib iid iie iih iii iio iir io- ioa iob iod ioe ioh ioi ioo ior ir- ira irb ird ire iri iro irr o-i oaa oab oad oae oah oai oao oar ob- oba obb obd obe obh obi obo obr oda odb odd ode odh odi odo odr oea oeb oed oee oeh oei oeo oer oha ohd ohe ohh ohi oho ohr oia oib oid oie oii oio oir oo- ooa oob ood ooh ooi ooo oor or- ora orb ord ore orh ori oro orr ra- raa rab rad rae rah rai rao rar rba rbb rbd rbe rbh rbi rbo rbr rda rdb rdd rde rdh rdi rdo rdr re- rea reb red ree reh rei reo rer rh- rha rhb rhd rhe rhh rhi rho rhr ria rib rid rie rih rii rio rir roa rob rod roe roh roi roo ror rra rrb rrd rrh rri rrr