-er a-a a-b a-i aaa aab aad aae aai aao aar aau aax ab- aba abb abd abe abi abo abr abu abx ad- ada adb add ade adi ado adr adu adx aea aeb aed aee aei aeo aer aeu aex ai- aia aib aid aie aii aio air aiu aix aoa aob aod aoe aoi aoo aor aou aox ar- ara arb ard are ari aro arr aru arx au- aua aub aud aue aui auo aur aux ax- axa axe axi axo axr axx b-u baa bab bad bae bai bao bar bau bax bba bbb bbd bbe bbi bbo bbr bbu bbx bda bdb bdd bde bdi bdo bdr bdu bdx be- bea beb bed bee bei beo ber beu bex bi- bia bib bid bie bii bio bir biu bix boa bob bod boe boi boo bor bou box bra brb brd bre bri bro brr bru brx bua bub bud bue bui buo bur buu bux bxb bxd bxi bxo bxx daa dab dad dae dai dao dar dau dax dba dbb dbd dbe dbi dbo dbr dbu dbx dda ddb ddd dde ddi ddo ddr ddu ddx de- dea deb ded dee dei deo der deu dex di- dia dib did die dii dio dir diu dix doa dob dod doe doi doo dor dou dox dra drb drd dre dri dro drr dru drx dua dub dud due dui duo dur dux dxd dxi dxo dxr dxx eaa eab ead eae eai eao ear eau eax eba ebb ebd ebe ebi ebo ebr ebu ebx ed- eda edb edd ede edi edo edr edu edx eea eeb eed eee eeo eer eex eia eib eid eie eii eio eir eiu eix eo- eoa eob eod eoe eoi eoo eor eou era erb erd ere eri ero err eru eu- eua eub eud eue eui eur eux ex- exa exd exe exi exo exr exu exx i-d ia- iaa iab iad iae iai iao iar iau iba ibb ibd ibe ibi ibo ibr ibu ibx ida idb idd ide idi ido idr idu idx ie- iea ied iee iei ier iex iia iib iid iie iii iio iir iiu iix io- ioa iob iod ioe ioi ioo ior iou ir- ira irb ird ire iri iro irr iru irx iu- iua iub iud iue iui iur ixe ixi o-i oaa oab oad oae oai oao oar oau oax ob- oba obb obd obe obi obo obr obu obx oda odb odd ode odi odo odr odu oea oeb oed oee oei oeo oer oex oia oib oid oie oii oio oir oiu oo- ooa oob ood ooi ooo oor oox or- ora orb ord ore ori oro orr oru orx ou- oua oud oue oui ouo our ox- oxa oxb oxi oxo oxx ra- raa rab rad rae rai rao rar rau rax rba rbb rbd rbe rbi rbo rbr rbu rbx rda rdb rdd rde rdi rdo rdr rdu rdx re- rea reb red ree rei reo rer reu rex ria rib rid rie rii rio rir rix roa rob rod roe roi roo ror rou rox rra rrb rrd rri rrr rru rua rub rud rue rui ruo rur ruu rux rxr ua- uaa uab uad uae uai uao uar uau uba ubb ube ubi ubo ubr ubu ubx uda udb udd ude udi udo udr udu udx uea ueb ued uee uei uer uia uib uid uie uii uio uir uiu uoa uob uod uoe uoo uor uox ur- ura urb urd ure uri uro urr uru urx uua uue uur uuu uxb uxo uxr uxu xaa xad xar xau xbe xbr xbx xda xdb xde xdi xdr xed xee xer xeu xex xia xie xii xio xiu xix xoa xod xoi xoo xor xox xrd xrx xue xui xxi xxo xxx