-al -er a-a a-b a-i aaa aab aae aaf aai aal aar aau aax ab- aba abb abe abf abi abl abr abu abx aea aeb aee aef aei ael aer aeu aex af- afa afb afe aff afi afl afr afu afx ai- aia aib aie aif aii ail air aiu aix al- ala alb ale alf ali all alr alu alx ar- ara arb are arf ari arl arr aru arx au- aua aub aue auf aui aul aur aux ax- axa axe axi axl axr axx b-u baa bab bae baf bai bal bar bau bax bba bbb bbe bbf bbi bbl bbr bbu bbx be- bea beb bee bef bei bel ber beu bex bfa bfb bfe bff bfi bfl bfr bfu bfx bi- bia bib bie bif bii bil bir biu bix bla blb ble blf bli bll blr blu blx bra brb bre brf bri brl brr bru brx bua bub bue buf bui bul bur buu bux bxb bxi bxl bxx eaa eab eae eaf eai eal ear eau eax eba ebb ebe ebf ebi ebl ebr ebu ebx eea eeb eee eef eel eer eex ef- efa efb efe eff efi efl efr efx eia eib eie eif eii eil eir eiu eix ela elb ele elf eli ell elr elu elx era erb ere erf eri erl err eru eu- eua eub eue euf eui eul eur eux ex- exa exe exi exl exr exu exx faa fab fae faf fai fal far fau fax fba fbb fbe fbf fbi fbl fbr fbu fbx fea feb fee fef fei fel fer feu fex ffa ffe fff ffi ffl ffr ffu ffx fia fib fie fif fii fil fir fiu fix fla flb fle flf fli fll flr flu flx fra frb fre frf fri frl frr fru fua fub fue fuf fui ful fur fuu fux fxe fxi fxr fxu fxx i-f ia- iaa iab iae iaf iai ial iar iau iba ibb ibe ibf ibi ibl ibr ibu ibx ie- iea iee ief iei iel ier iex ifa ifb ife iff ifi ifl ifr ifu ifx iia iib iie iif iii iil iir iiu iix il- ila ilb ile ilf ili ill ilr ilu ilx ir- ira irb ire irf iri irl irr iru irx iu- iua iub iue iui iur ixe ixi ixl la- laa lab lae laf lai lal lar lau lax lba lbb lbe lbf lbi lbl lbr lbu lbx lea leb lee lef lei lel ler leu lex lfa lfb lfe lff lfi lfl lfr lfu lfx lia lib lie lif lii lil lir liu lix lla llb lle llf lli lll llr llu lra lrb lrf lri lrr lru lua lub lue luf lui lul lur luu lux lxi lxr lxx ra- raa rab rae raf rai ral rar rau rax rba rbb rbe rbf rbi rbl rbr rbu rbx re- rea reb ree ref rei rel rer reu rex rfa rfb rfe rff rfi rfl rfr rfu ria rib rie rif rii ril rir rix rla rle rlf rli rll rlr rlu rra rrb rrf rri rrl rrr rru rua rub rue ruf rui rur ruu rux rxr ua- uaa uab uae uaf uai ual uar uau uba ubb ube ubf ubi ubl ubr ubu ubx uea ueb uee uef uei uel uer ufa ufe uff ufi ufl ufr ufu ufx uia uib uie uif uii uil uir uiu ula ulb ule ulf uli ull ulr ulu ur- ura urb ure urf uri url urr uru urx uua uue uur uuu uxb uxf uxr uxu xaa xaf xal xar xau xbe xbl xbr xbx xee xel xer xeu xex xfa xfe xfl xfx xia xie xii xiu xix xla xlb xlf xli xlr xrf xrx xue xui xul xxi xxl xxx