a-a a-b a-t aaa aab aao aas aat aau aay ab- aba abb abo abs abt abu aby aoa aob aoo aos aot aou as- asa asb aso ass ast asu asy at- ata atb ato ats att atu au- aua aub auo aus aut ay- aya ayo ays ayt ayu b-u baa bab bao bas bat bau bay bba bbb bbo bbs bbt bbu bby boa bob boo bos bot bou boy bsa bsb bso bss bst bsu bsy bta btb bto bts btt btu bty bua bub buo bus but buu buy by- bya byo bys byt byu oaa oab oao oas oat oau ob- oba obb obo obs obt obu oby oo- ooa oob ooo oos oot os- osa osb oso oss ost osu ot- ota otb oto ots ott otu ou- oua ouo ous out oya oyo oys saa sab sao sas sat sau say sba sbb sbo sbs sbt sbu sby soa sob soo sos sot sou soy ss- ssa ssb sso sss sst ssu sta stb sto sts stt stu sty sua sub suo sus sut suu suy sy- sya syb sys syt syu taa tab tao tas tat tau tay tba tbb tbo tbs tbt tbu to- toa tob too tos tot tou toy tsa tsb tso tss tst tsu tsy tta ttb tto tts ttt ttu tty tua tub tuo tus tut tuu tuy tya tyo tys tyt ua- uaa uab uao uas uat uau uay uba ubb ubo ubs ubt ubu uby uoa uob uoo uos uot usa usb uso uss ust usu uta utb uto uts utt utu uty uua uus uut uuu uyo uys uyu yaa yab yao yas yat yau yay ybs yby yob yoo yos yot you yoy ysa ysb yso yss yst ysu ysy yta yto yts ytt ytu yua yuo yus yut yuu yuy yyb yys yyt yyu yyy