a-a a-b aaa aab aan aap aar aay ab- aba abb abn abp abr aby an- ana anb ann anp anr any ap- apa apb apn app apr apy ar- ara arb arn arp arr ary ay- aya ayn ayp ayr b-p baa bab ban bap bar bay bba bbb bbn bbp bbr bby bna bnb bnn bnp bnr bpa bpb bpn bpp bpr bpy bra brb brn brp brr bry by- bya byn byp byr naa nab nan nap nar nay nba nbb nbn nbp nbr nna nnb nnn nnp npa npb npn npp npr nra nrb nrn nrp nrr nry nya nyn nyp nyy p-p paa pab pan pap par pay pba pbb pbn pbp pbr pby pn- pna pnb pnn pnp pnr pny ppa ppb ppn ppp ppr pra prb prn prp prr pry py- pya pyb pyn pyr ra- raa rab ran rap rar ray rba rbb rbn rbp rbr rna rnb rnn rnp rnr rny rpa rpb rpn rpp rpr rra rrb rrn rrp rrr ry- rya ryn ryr ryy yaa yab yan yap yar yay ybp ybr yby yna ynn ynp yny ypa yra yrn yrp yyb yyy