-er -ey a-a a-b aaa aab aae aaf aar aau aay ab- aba abb abe abf abr abu aby aea aeb aee aef aer aeu aey af- afa afb afe aff afr afu afy ar- ara arb are arf arr aru ary au- aua aub aue auf aur ay- aya aye ayf ayr ayu b-u baa bab bae baf bar bau bay bba bbb bbe bbf bbr bbu bby be- bea beb bee bef ber beu bey bfa bfb bfe bff bfr bfu bfy bra brb bre brf brr bru bry bua bub bue buf bur buu buy by- bya bye byf byr byu eaa eab eae eaf ear eau eba ebb ebe ebf ebr ebu eby eea eeb eee eef eer eey ef- efa efb efe eff efr era erb ere erf err eru ery eu- eua eub eue euf eur eya eye eyr faa fab fae faf far fau fay fba fbb fbe fbf fbr fbu fea feb fee fef fer feu fey ffa ffe fff ffr ffu ffy fra frb fre frf frr fru fry fua fub fue fuf fur fuu fy- fya fyb fye ra- raa rab rae raf rar rau ray rba rbb rbe rbf rbr rbu re- rea reb ree ref rer reu rey rfa rfb rfe rff rfr rfu rra rrb rrf rrr rru rua rub rue ruf rur ruu ruy ry- rya rye ryf ryr ryu ryy ua- uaa uab uae uaf uar uau uay uba ubb ube ubf ubr ubu uby uea ueb uee uef uer uey ufa ufe uff ufr ufu ur- ura urb ure urf urr uru ury uua uue uur uuu uyu yaa yab yae yaf yar yau yay ybe ybf ybr yby yea yeb yee yef yer yey yfa yfe yff yfr yfu yra yre yrf yru yua yue yur yuu yuy yyb yye yyf yyu yyy