a-a a-b a-i aaa aab aae aai aao aas aau aax ab- aba abb abe abi abo abs abu abx aea aeb aee aei aeo aes aeu aex ai- aia aib aie aii aio ais aiu aix aoa aob aoe aoi aoo aos aou aox as- asa asb ase asi aso ass asu asx au- aua aub aue aui auo aus aux ax- axa axe axi axo axs axx b-u baa bab bae bai bao bas bau bax bba bbb bbe bbi bbo bbs bbu bbx be- bea beb bee bei beo bes beu bex bi- bia bib bie bii bio bis biu bix boa bob boe boi boo bos bou box bsa bsb bse bsi bso bss bsu bsx bua bub bue bui buo bus buu bux bxb bxi bxo bxx eaa eab eae eai eao eas eau eax eba ebb ebe ebi ebo ebs ebu ebx eea eeb eee eeo ees eex eia eib eie eii eio eis eiu eix eo- eoa eob eoe eoi eoo eos eou es- esa esb ese esi eso ess esu esx eu- eua eub eue eui eus eux ex- exa exe exi exo exs exu exx ia- iaa iab iae iai iao ias iau iba ibb ibe ibi ibo ibs ibu ibx ie- iea iee iei ies iex iia iib iie iii iio iis iiu iix io- ioa iob ioe ioi ioo ios iou is- isa isb ise isi iso iss isu iu- iua iub iue iui ius ixe ixi o-i oaa oab oae oai oao oas oau oax ob- oba obb obe obi obo obs obu obx oea oeb oee oei oeo oes oex oia oib oie oii oio ois oiu oo- ooa oob ooi ooo oos oox os- osa osb ose osi oso oss osu osx ou- oua oue oui ouo ous ox- oxa oxb oxi oxo oxx saa sab sae sai sao sas sau sax sba sbb sbe sbi sbo sbs sbu sbx se- sea seb see sei seo ses seu sex sia sib sie sii sio sis siu six soa sob soe soi soo sos sou sox ss- ssa ssb sse ssi sso sss ssu ssx sua sub sue sui suo sus suu sux sxi sxs sxu ua- uaa uab uae uai uao uas uau uba ubb ube ubi ubo ubs ubu ubx uea ueb uee uei ues uia uib uie uii uio uis uiu uoa uob uoe uoo uos uox usa usb use usi uso uss usu usx uua uue uus uuu uxb uxo uxu xaa xas xau xbe xbx xee xes xeu xex xia xie xii xio xis xiu xix xoa xoi xoo xos xox xsa xsb xsi xss xue xui xus xxi xxo xxx