-er a-a a-b a-i aaa aab aae aaf aai aak aar aau aax ab- aba abb abe abf abi abk abr abu abx aea aeb aee aef aei aek aer aeu aex af- afa afb afe aff afi afk afr afu afx ai- aia aib aie aif aii aik air aiu aix aka akb ake aki akk akr aku ar- ara arb are arf ari ark arr aru arx au- aua aub aue auf aui auk aur aux ax- axa axe axi axk axr axx b-u baa bab bae baf bai bak bar bau bax bba bbb bbe bbf bbi bbk bbr bbu bbx be- bea beb bee bef bei bek ber beu bex bfa bfb bfe bff bfi bfr bfu bfx bi- bia bib bie bif bii bik bir biu bix bka bkb bke bkf bkk bkr bkx bra brb bre brf bri brk brr bru brx bua bub bue buf bui buk bur buu bux bxb bxi bxx eaa eab eae eaf eai eak ear eau eax eba ebb ebe ebf ebi ebk ebr ebu ebx eea eeb eee eef eek eer eex ef- efa efb efe eff efi efr efx eia eib eie eif eii eik eir eiu eix eka ekb eke ekf eki ekr eku era erb ere erf eri erk err eru eu- eua eub eue euf eui eur eux ex- exa exe exi exr exu exx faa fab fae faf fai fak far fau fax fba fbb fbe fbf fbi fbk fbr fbu fbx fea feb fee fef fei fek fer feu fex ffa ffe fff ffi ffk ffr ffu ffx fia fib fie fif fii fik fir fiu fix fka fkb fkf fki fkk fra frb fre frf fri frk frr fru fua fub fue fuf fui fuk fur fuu fux fxe fxi fxr fxu fxx i-f ia- iaa iab iae iaf iai iar iau iba ibb ibe ibf ibi ibk ibr ibu ibx ie- iea iee ief iei iek ier iex ifa ifb ife iff ifi ifr ifu ifx iia iib iie iif iii iir iiu iix ika ikb ike ikf iki ikk ikr iku ikx ir- ira irb ire irf iri irk irr iru irx iu- iua iub iue iui iur ixe ixi ka- kaa kab kae kaf kai kak kar kau kax kba kbb kbe kbf kbi kbk kbr kbu kbx ke- kea keb kee kef kei kek ker kex kfa kff kfi kfu kfx kia kib kie kif kii kik kir kiu kix kkb kke kki kkk kkr kku kra krf kri krk krr kru kub kue kui kuk kur kuu ra- raa rab rae raf rai rak rar rau rax rba rbb rbe rbf rbi rbk rbr rbu rbx re- rea reb ree ref rei rek rer reu rex rfa rfb rfe rff rfi rfk rfr rfu ria rib rie rif rii rik rir rix rkb rke rkf rkk rku rra rrb rrf rri rrk rrr rru rua rub rue ruf rui ruk rur ruu rux rxr ua- uaa uab uae uaf uai uak uar uau uba ubb ube ubf ubi ubk ubr ubu ubx uea ueb uee uef uei uer ufa ufe uff ufi ufr ufu ufx uia uib uie uif uii uir uiu uka ukb uke ukf uki ukk ukr uku ur- ura urb ure urf uri urk urr uru urx uua uue uur uuu uxb uxf uxr uxu xaa xaf xak xar xau xbe xbr xbx xee xer xeu xex xfa xfe xfx xia xie xii xiu xix xkb xke xrf xrx xue xui xxi xxx