-al -er a-a a-b aaa aab aae aal aan aar aau aax ab- aba abb abe abl abn abr abu abx aea aeb aee ael aen aer aeu aex al- ala alb ale all aln alr alu alx an- ana anb ane anl ann anr anu anx ar- ara arb are arl arn arr aru arx au- aua aub aue aul aun aur aux ax- axa axe axl axn axr axx b-u baa bab bae bal ban bar bau bax bba bbb bbe bbl bbn bbr bbu bbx be- bea beb bee bel ben ber beu bex bla blb ble bll bln blr blu blx bna bnb bne bnl bnn bnr bnu bnx bra brb bre brl brn brr bru brx bua bub bue bul bun bur buu bux bxb bxl bxn bxx eaa eab eae eal ean ear eau eax eba ebb ebe ebl ebn ebr ebu ebx eea eeb eee eel een eer eex ela elb ele ell eln elr elu elx en- ena enb ene enl enn enr enu era erb ere erl ern err eru eu- eua eub eue eul eun eur eux ex- exa exe exl exr exu exx la- laa lab lae lal lan lar lau lax lba lbb lbe lbl lbr lbu lbx lea leb lee lel len ler leu lex lla llb lle lll lln llr llu lna lnb lne lnl lnn lnr lnu lra lrb lrn lrr lru lua lub lue lul lun lur luu lux lxr lxx naa nab nae nal nan nar nau nax nba nbb nbe nbl nbn nbr nbu nbx ne- nea neb nee nel nen ner neu nex nla nlb nle nll nln nlr nlu nlx nna nnb nne nnl nnn nnu nra nrb nre nrl nrn nrr nru nrx nua nub nue nul nun nur nuu nux nxl ra- raa rab rae ral ran rar rau rax rba rbb rbe rbl rbn rbr rbu rbx re- rea reb ree rel ren rer reu rex rla rle rll rln rlr rlu rna rnb rnn rnr rnu rra rrb rrl rrn rrr rru rua rub rue run rur ruu rux rxr ua- uaa uab uae ual uan uar uau uba ubb ube ubl ubn ubr ubu ubx uea ueb uee uel uen uer ula ulb ule ull uln ulr ulu un- una unb une unl unn unr unu unx ur- ura urb ure url urn urr uru urx uua uue uun uur uuu uxb uxr uxu xaa xal xan xar xau xbe xbl xbr xbx xee xel xen xer xeu xex xla xlb xlr xna xnu xrx xue xul xun xxl xxx