-er a-a a-i aaa aad aae aai aak aao aar aax ad- ada add ade adi adk ado adr adx aea aed aee aei aek aeo aer aex ai- aia aid aie aii aik aio air aix aka akd ake aki akk ako akr aoa aod aoe aoi aok aoo aor aox ar- ara ard are ari ark aro arr arx ax- axa axe axi axk axo axr axx daa dad dae dai dak dao dar dax dda ddd dde ddi ddk ddo ddr ddx de- dea ded dee dei dek deo der dex di- dia did die dii dik dio dir dix dka dke dki dkk dko dkr dkx doa dod doe doi dok doo dor dox dra drd dre dri drk dro drr drx dxd dxi dxo dxr dxx eaa ead eae eai eak eao ear eax ed- eda edd ede edi edk edo edr edx eea eed eee eek eeo eer eex eia eid eie eii eik eio eir eix eka ekd eke eki eko ekr eo- eoa eod eoe eoi eok eoo eor era erd ere eri erk ero err ex- exa exd exe exi exo exr exx i-d ia- iaa iad iae iai iao iar ida idd ide idi idk ido idr idx ie- iea ied iee iei iek ier iex iia iid iie iii iio iir iix ika ike iki ikk iko ikr ikx io- ioa iod ioe ioi ioo ior ir- ira ird ire iri irk iro irr irx ixe ixi ka- kaa kad kae kai kak kao kar kax kda kde kdk kdo kdr kdx ke- kea ked kee kei kek keo ker kex kia kid kie kii kik kio kir kix kke kki kkk kkr koa kod koe koi kok koo kor kra krd kri krk kro krr kxo o-i oaa oad oae oai oak oao oar oax oda odd ode odi odo odr oea oed oee oei oeo oer oex oia oid oie oii oik oio oir oka okd oke oki okk oko okr oo- ooa ood ooi ook ooo oor oox or- ora ord ore ori ork oro orr orx ox- oxa oxi oxo oxx ra- raa rad rae rai rak rao rar rax rda rdd rde rdi rdo rdr rdx re- rea red ree rei rek reo rer rex ria rid rie rii rik rio rir rix rke rkk rko roa rod roe roi rok roo ror rox rra rrd rri rrk rrr rxr xaa xad xak xar xda xde xdi xdk xdr xed xee xer xex xia xie xii xio xix xke xoa xod xoi xok xoo xor xox xrd xrx xxi xxo xxx