a-a a-b aaa aab aan aao aap aar aas aay ab- aba abb abn abo abp abr abs aby an- ana anb ann ano anp anr ans any aoa aob aon aoo aop aor aos ap- apa apb apn apo app apr aps apy ar- ara arb arn aro arp arr ars ary as- asa asb asn aso asp asr ass asy ay- aya ayn ayo ayp ayr ays b-p baa bab ban bao bap bar bas bay bba bbb bbn bbo bbp bbr bbs bby bna bnb bnn bno bnp bnr bns boa bob bon boo bop bor bos boy bpa bpb bpn bpo bpp bpr bps bpy bra brb brn bro brp brr brs bry bsa bsb bsn bso bsp bsr bss bsy by- bya byn byo byp byr bys naa nab nan nao nap nar nas nay nba nbb nbn nbo nbp nbr nbs nna nnb nnn nno nnp nns no- noa nob non noo nop nor nos noy npa npb npn npo npp npr nps nra nrb nrn nro nrp nrr nrs nry nsa nsb nsn nso nsp nsr nss nsy nya nyn nyo nyp nys nyy oaa oab oan oao oap oar oas ob- oba obb obn obo obp obr obs oby on- ona onb onn ono onp onr ons ony oo- ooa oob oon ooo oop oor oos op- opa opb opn opo opp opr ops opy or- ora orb orn oro orp orr ors ory os- osa osb osn oso osp osr oss oya oyo oys p-p paa pab pan pao pap par pas pay pba pbb pbn pbo pbp pbr pbs pby pn- pna pnb pnn pno pnp pnr pns pny poa pob pon poo pop por pos poy ppa ppb ppn ppo ppp ppr pps pra prb prn pro prp prr prs pry ps- psa psb psn pso psp psr pss psy py- pya pyb pyn pyo pyr pys ra- raa rab ran rao rap rar ras ray rba rbb rbn rbo rbp rbr rbs rna rnb rnn rno rnp rnr rns rny roa rob ron roo rop ror ros roy rpa rpb rpn rpo rpp rpr rps rra rrb rrn rrp rrr rrs rsa rsb rsn rso rsp rsr rss ry- rya ryn ryo ryr rys ryy saa sab san sao sap sar sas say sba sbb sbn sbo sbp sbr sbs sby sna snb snn sno snp snr sns sny soa sob son soo sop sor sos soy spa spb spn spo spp spr sps spy sr- sra srb srn sro srp srr srs sry ss- ssa ssb ssn sso ssp ssr sss sy- sya syb syn syp syr sys yaa yab yan yao yap yar yas yay ybp ybr ybs yby yna ynn ynp yns yny yob yon yoo yop yor yos yoy ypa ypo yps yra yrn yro yrp yrs ysa ysb yso ysp ysr yss ysy yyb yys yyy