-er a-a a-b a-i a-t aaa aab aae aai aao aar aat aau aax ab- aba abb abe abi abo abr abt abu abx aea aeb aee aei aeo aer aet aeu aex ai- aia aib aie aii aio air ait aiu aix aoa aob aoe aoi aoo aor aot aou aox ar- ara arb are ari aro arr art aru arx at- ata atb ate ati ato atr att atu atx au- aua aub aue aui auo aur aut aux ax- axa axe axi axo axr axt axx b-u baa bab bae bai bao bar bat bau bax bba bbb bbe bbi bbo bbr bbt bbu bbx be- bea beb bee bei beo ber bet beu bex bi- bia bib bie bii bio bir bit biu bix boa bob boe boi boo bor bot bou box bra brb bre bri bro brr brt bru brx bta btb bte bti bto btr btt btu btx bua bub bue bui buo bur but buu bux bxb bxi bxo bxx eaa eab eae eai eao ear eat eau eax eba ebb ebe ebi ebo ebr ebt ebu ebx eea eeb eee eeo eer eet eex eia eib eie eii eio eir eit eiu eix eo- eoa eob eoe eoi eoo eor eot eou era erb ere eri ero err ert eru eta etb ete eti eto etr ett etu etx eu- eua eub eue eui eur eut eux ex- exa exe exi exo exr ext exu exx ia- iaa iab iae iai iao iar iat iau iba ibb ibe ibi ibo ibr ibt ibu ibx ie- iea iee iei ier iet iex iia iib iie iii iio iir iit iiu iix io- ioa iob ioe ioi ioo ior iot iou ir- ira irb ire iri iro irr irt iru irx ita itb ite iti ito itt itu itx iu- iua iub iue iui iur iut ixe ixi o-i oaa oab oae oai oao oar oat oau oax ob- oba obb obe obi obo obr obt obu obx oea oeb oee oei oeo oer oet oex oia oib oie oii oio oir oit oiu oo- ooa oob ooi ooo oor oot oox or- ora orb ore ori oro orr ort oru orx ot- ota otb ote oti oto otr ott otu ou- oua oue oui ouo our out ox- oxa oxb oxi oxo oxt oxx ra- raa rab rae rai rao rar rat rau rax rba rbb rbe rbi rbo rbr rbt rbu rbx re- rea reb ree rei reo rer ret reu rex ria rib rie rii rio rir rit rix roa rob roe roi roo ror rot rou rox rra rrb rri rrr rrt rru rta rtb rte rti rto rtr rtt rtu rtx rua rub rue rui ruo rur rut ruu rux rxr t-x taa tab tae tai tao tar tat tau tax tba tbb tbe tbi tbo tbr tbt tbu te- tea teb tee tei teo ter tet teu tex tia tib tie tii tio tir tit tiu tix to- toa tob toe toi too tor tot tou tox tra trb tre tri tro trr trt tru trx tta ttb tte tti tto ttr ttt ttu ttx tua tub tue tui tuo tur tut tuu tux txe txi txt txu ua- uaa uab uae uai uao uar uat uau uba ubb ube ubi ubo ubr ubt ubu ubx uea ueb uee uei uer uet uia uib uie uii uio uir uit uiu uoa uob uoe uoo uor uot uox ur- ura urb ure uri uro urr urt uru urx uta utb ute uti uto utr utt utu utx uua uue uur uut uuu uxb uxo uxr uxt uxu xaa xar xat xau xbe xbr xbx xee xer xet xeu xex xia xie xii xio xit xiu xix xoa xoi xoo xor xot xox xrt xrx xti xtr xtx xue xui xxi xxo xxx