-er -ey a-a a-b aaa aab aae aan aao aar aax aay ab- aba abb abe abn abo abr abx aby aea aeb aee aen aeo aer aex aey an- ana anb ane ann ano anr anx any aoa aob aoe aon aoo aor aox ar- ara arb are arn aro arr arx ary ax- axa axe axn axo axr axx ay- aya aye ayn ayo ayr ayx baa bab bae ban bao bar bax bay bba bbb bbe bbn bbo bbr bbx bby be- bea beb bee ben beo ber bex bey bna bnb bne bnn bno bnr bnx boa bob boe bon boo bor box boy bra brb bre brn bro brr brx bry bxb bxn bxo bxx by- bya bye byn byo byr eaa eab eae ean eao ear eax eba ebb ebe ebn ebo ebr ebx eby eea eeb eee een eeo eer eex eey en- ena enb ene enn eno enr eny eo- eoa eob eoe eon eoo eor era erb ere ern ero err ery ex- exa exe exo exr exx exy eya eye eyn eyo eyr naa nab nae nan nao nar nax nay nba nbb nbe nbn nbo nbr nbx ne- nea neb nee nen neo ner nex ney nna nnb nne nnn nno no- noa nob noe non noo nor nox noy nra nrb nre nrn nro nrr nrx nry nya nye nyn nyo nyx nyy oaa oab oae oan oao oar oax ob- oba obb obe obn obo obr obx oby oea oeb oee oen oeo oer oex oey on- ona onb one onn ono onr onx ony oo- ooa oob oon ooo oor oox or- ora orb ore orn oro orr orx ory ox- oxa oxb oxn oxo oxx oxy oya oye oyo ra- raa rab rae ran rao rar rax ray rba rbb rbe rbn rbo rbr rbx re- rea reb ree ren reo rer rex rey rna rnb rnn rno rnr rny roa rob roe ron roo ror rox roy rra rrb rrn rrr rxr ry- rya rye ryn ryo ryr ryy xaa xan xar xbe xbr xbx xee xen xer xex xna xno xoa xon xoo xor xox xrx xry xxo xxx xxy xyr xyy yaa yab yae yan yao yar yax yay ybe ybr yby yea yeb yee yen yeo yer yex yey yna yne ynn yny yob yoe yon yoo yor yox yoy yra yre yrn yro yxa yxe yxy yyb yye yyy