-er -ey a-a a-b aaa aab aae aao aap aar aay ab- aba abb abe abo abp abr aby aea aeb aee aeo aep aer aey aoa aob aoe aoo aop aor ap- apa apb ape apo app apr apy ar- ara arb are aro arp arr ary ay- aya aye ayo ayp ayr b-p baa bab bae bao bap bar bay bba bbb bbe bbo bbp bbr bby be- bea beb bee beo bep ber bey boa bob boe boo bop bor boy bpa bpb bpe bpo bpp bpr bpy bra brb bre bro brp brr bry by- bya bye byo byp byr eaa eab eae eao eap ear eba ebb ebe ebo ebp ebr eby eea eeb eee eeo eep eer eey eo- eoa eob eoe eoo eop eor ep- epa epb epe epo epp epr era erb ere ero erp err ery eya eye eyo eyp eyr oaa oab oae oao oap oar ob- oba obb obe obo obp obr oby oea oeb oee oeo oep oer oey oo- ooa oob ooo oop oor op- opa opb ope opo opp opr opy or- ora orb ore oro orp orr ory oya oye oyo p-p paa pab pae pao pap par pay pba pbb pbe pbo pbp pbr pby pea peb pee peo pep per pey poa pob poe poo pop por poy ppa ppb ppe ppo ppp ppr pra prb pre pro prp prr pry py- pya pyb pye pyo pyr ra- raa rab rae rao rap rar ray rba rbb rbe rbo rbp rbr re- rea reb ree reo rep rer rey roa rob roe roo rop ror roy rpa rpb rpe rpo rpp rpr rra rrb rrp rrr ry- rya rye ryo ryr ryy yaa yab yae yao yap yar yay ybe ybp ybr yby yea yeb yee yeo yep yer yey yob yoe yoo yop yor yoy ypa ypo yra yre yro yrp yyb yye yyy