-ey a-a a-b aaa aab aae aao aap aas aay ab- aba abb abe abo abp abs aby aea aeb aee aeo aep aes aey aoa aob aoe aoo aop aos ap- apa apb ape apo app aps apy as- asa asb ase aso asp ass asy ay- aya aye ayo ayp ays b-p baa bab bae bao bap bas bay bba bbb bbe bbo bbp bbs bby be- bea beb bee beo bep bes bey boa bob boe boo bop bos boy bpa bpb bpe bpo bpp bps bpy bsa bsb bse bso bsp bss bsy by- bya bye byo byp bys eaa eab eae eao eap eas eba ebb ebe ebo ebp ebs eby eea eeb eee eeo eep ees eey eo- eoa eob eoe eoo eop eos ep- epa epb epe epo epp eps es- esa esb ese eso esp ess esy eya eye eyo eyp eys oaa oab oae oao oap oas ob- oba obb obe obo obp obs oby oea oeb oee oeo oep oes oey oo- ooa oob ooo oop oos op- opa opb ope opo opp ops opy os- osa osb ose oso osp oss oya oye oyo oys p-p paa pab pae pao pap pas pay pba pbb pbe pbo pbp pbs pby pea peb pee peo pep pes pey poa pob poe poo pop pos poy ppa ppb ppe ppo ppp pps ps- psa psb pse pso psp pss psy py- pya pyb pye pyo pys saa sab sae sao sap sas say sba sbb sbe sbo sbp sbs sby se- sea seb see seo sep ses sey soa sob soe soo sop sos soy spa spb spe spo spp sps spy ss- ssa ssb sse sso ssp sss sy- sya syb sye syp sys yaa yab yae yao yap yas yay ybe ybp ybs yby yea yeb yee yeo yep yes yey yob yoe yoo yop yos yoy ypa ypo yps ysa ysb yse yso ysp yss ysy yyb yye yys yyy