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