a-a a-b aaa aab aan aao aas aau aay ab- aba abb abn abo abs abu aby an- ana anb ann ano ans anu any aoa aob aon aoo aos aou as- asa asb asn aso ass asu asy au- aua aub aun auo aus ay- aya ayn ayo ays ayu b-u baa bab ban bao bas bau bay bba bbb bbn bbo bbs bbu bby bna bnb bnn bno bns bnu boa bob bon boo bos bou boy bsa bsb bsn bso bss bsu bsy bua bub bun buo bus buu buy by- bya byn byo bys byu naa nab nan nao nas nau nay nba nbb nbn nbo nbs nbu nna nnb nnn nno nns nnu no- noa nob non noo nos nou noy nsa nsb nsn nso nss nsu nsy nua nub nun nuo nus nuu nuy nya nyn nyo nys nyu nyy oaa oab oan oao oas oau ob- oba obb obn obo obs obu oby on- ona onb onn ono ons onu ony oo- ooa oob oon ooo oos os- osa osb osn oso oss osu ou- oua oun ouo ous oya oyo oys saa sab san sao sas sau say sba sbb sbn sbo sbs sbu sby sna snb snn sno sns snu sny soa sob son soo sos sou soy ss- ssa ssb ssn sso sss ssu sua sub sun suo sus suu suy sy- sya syb syn sys syu ua- uaa uab uan uao uas uau uay uba ubb ubn ubo ubs ubu uby un- una unb unn uno uns unu uny uoa uob uon uoo uos usa usb usn uso uss usu uua uun uus uuu uyo uys uyu yaa yab yan yao yas yau yay ybs yby yna ynn yns ynu yny yob yon yoo yos you yoy ysa ysb yso yss ysu ysy yua yun yuo yus yuu yuy yyb yys yyu yyy