a-a a-b a-i aaa aab aai aan aao aar aay ab- aba abb abi abn abo abr aby ai- aia aib aii ain aio air aiy an- ana anb ani ann ano anr any aoa aob aoi aon aoo aor ar- ara arb ari arn aro arr ary ay- aya ayi ayn ayo ayr baa bab bai ban bao bar bay bba bbb bbi bbn bbo bbr bby bi- bia bib bii bin bio bir biy bna bnb bni bnn bno bnr boa bob boi bon boo bor boy bra brb bri brn bro brr bry by- bya byi byn byo byr ia- iaa iab iai ian iao iar iba ibb ibi ibn ibo ibr iby iia iib iii iin iio iir in- ina inb ini inn ino inr iny io- ioa iob ioi ion ioo ior ir- ira irb iri irn iro irr iry iya iyo iyr iyy n-i naa nab nai nan nao nar nay nba nbb nbi nbn nbo nbr nia nib nii nin nio nir nna nnb nni nnn nno no- noa nob noi non noo nor noy nra nrb nri nrn nro nrr nry nya nyn nyo nyy o-i oaa oab oai oan oao oar ob- oba obb obi obn obo obr oby oia oib oii oin oio oir on- ona onb oni onn ono onr ony oo- ooa oob ooi oon ooo oor or- ora orb ori orn oro orr ory oya oyi oyo ra- raa rab rai ran rao rar ray rba rbb rbi rbn rbo rbr ria rib rii rin rio rir riy rna rnb rni rnn rno rnr rny roa rob roi ron roo ror roy rra rrb rri rrn rrr ry- rya ryn ryo ryr ryy yaa yab yai yan yao yar yay ybi ybr yby yii yin yio yir yna ynn yny yob yoi yon yoo yor yoy yra yrn yro yyb yyy