a-a a-b aaa aab aan aao aap aar aay ab- aba abb abn abo abp abr aby an- ana anb ann ano anp anr any aoa aob aon aoo aop aor ap- apa apb apn apo app apr apy ar- ara arb arn aro arp arr ary ay- aya ayn ayo ayp ayr b-p baa bab ban bao bap bar bay bba bbb bbn bbo bbp bbr bby bna bnb bnn bno bnp bnr boa bob bon boo bop bor boy bpa bpb bpn bpo bpp bpr bpy bra brb brn bro brp brr bry by- bya byn byo byp byr naa nab nan nao nap nar nay nba nbb nbn nbo nbp nbr nna nnb nnn nno nnp no- noa nob non noo nop nor noy npa npb npn npo npp npr nra nrb nrn nro nrp nrr nry nya nyn nyo nyp nyy oaa oab oan oao oap oar ob- oba obb obn obo obp obr oby on- ona onb onn ono onp onr ony oo- ooa oob oon ooo oop oor op- opa opb opn opo opp opr opy or- ora orb orn oro orp orr ory oya oyo p-p paa pab pan pao pap par pay pba pbb pbn pbo pbp pbr pby pn- pna pnb pnn pno pnp pnr pny poa pob pon poo pop por poy ppa ppb ppn ppo ppp ppr pra prb prn pro prp prr pry py- pya pyb pyn pyo pyr ra- raa rab ran rao rap rar ray rba rbb rbn rbo rbp rbr rna rnb rnn rno rnp rnr rny roa rob ron roo rop ror roy rpa rpb rpn rpo rpp rpr rra rrb rrn rrp rrr ry- rya ryn ryo ryr ryy yaa yab yan yao yap yar yay ybp ybr yby yna ynn ynp yny yob yon yoo yop yor yoy ypa ypo yra yrn yro yrp yyb yyy