-er -ey a-a a-b aaa aab aae aao aap aar aax aay ab- aba abb abe abo abp abr abx aby aea aeb aee aeo aep aer aex aey aoa aob aoe aoo aop aor aox ap- apa apb ape apo app apr apx apy ar- ara arb are aro arp arr arx ary ax- axa axe axo axp axr axx ay- aya aye ayo ayp ayr ayx b-p baa bab bae bao bap bar bax bay bba bbb bbe bbo bbp bbr bbx bby be- bea beb bee beo bep ber bex bey boa bob boe boo bop bor box boy bpa bpb bpe bpo bpp bpr bpx bpy bra brb bre bro brp brr brx bry bxb bxo bxx by- bya bye byo byp byr eaa eab eae eao eap ear eax eba ebb ebe ebo ebp ebr ebx eby eea eeb eee eeo eep eer eex eey eo- eoa eob eoe eoo eop eor ep- epa epb epe epo epp epr epx era erb ere ero erp err ery ex- exa exe exo exp exr exx exy eya eye eyo eyp eyr oaa oab oae oao oap oar oax ob- oba obb obe obo obp obr obx oby oea oeb oee oeo oep oer oex oey oo- ooa oob ooo oop oor oox op- opa opb ope opo opp opr opx opy or- ora orb ore oro orp orr orx ory ox- oxa oxb oxo oxx oxy oya oye oyo p-p paa pab pae pao pap par pax pay pba pbb pbe pbo pbp pbr pbx pby pea peb pee peo pep per pex pey poa pob poe poo pop por pox poy ppa ppb ppe ppo ppp ppr ppx pra prb pre pro prp prr prx pry pxe pxr py- pya pyb pye pyo pyr pyx ra- raa rab rae rao rap rar rax ray rba rbb rbe rbo rbp rbr rbx re- rea reb ree reo rep rer rex rey roa rob roe roo rop ror rox roy rpa rpb rpe rpo rpp rpr rpx rra rrb rrp rrr rxp rxr ry- rya rye ryo ryr ryy xaa xap xar xbe xbr xbx xee xep xer xex xoa xoo xop xor xox xpa xpb xpe xpo xpp xrx xry xxo xxp xxx xxy xyp xyr xyy yaa yab yae yao yap yar yax yay ybe ybp ybr yby yea yeb yee yeo yep yer yex yey yob yoe yoo yop yor yox yoy ypa ypo yra yre yro yrp yxa yxe yxy yyb yye yyy