a-a a-b a-t aaa aab aao aap aar aat aay ab- aba abb abo abp abr abt aby aoa aob aoo aop aor aot ap- apa apb apo app apr apt apy ar- ara arb aro arp arr art ary at- ata atb ato atp atr att ay- aya ayo ayp ayr ayt b-p baa bab bao bap bar bat bay bba bbb bbo bbp bbr bbt bby boa bob boo bop bor bot boy bpa bpb bpo bpp bpr bpt bpy bra brb bro brp brr brt bry bta btb bto btp btr btt bty by- bya byo byp byr byt oaa oab oao oap oar oat ob- oba obb obo obp obr obt oby oo- ooa oob ooo oop oor oot op- opa opb opo opp opr opt opy or- ora orb oro orp orr ort ory ot- ota otb oto otp otr ott oya oyo p-p paa pab pao pap par pat pay pba pbb pbo pbp pbr pbt pby poa pob poo pop por pot poy ppa ppb ppo ppp ppr ppt pra prb pro prp prr prt pry pt- pta ptb pto ptp ptr ptt pty py- pya pyb pyo pyr pyt ra- raa rab rao rap rar rat ray rba rbb rbo rbp rbr rbt roa rob roo rop ror rot roy rpa rpb rpo rpp rpr rpt rra rrb rrp rrr rrt rta rtb rto rtp rtr rtt rty ry- rya ryo ryr ryy taa tab tao tap tar tat tay tba tbb tbo tbp tbr tbt to- toa tob too top tor tot toy tpa tpb tpo tpp tpr tpt tra trb tro trp trr trt try tta ttb tto ttp ttr ttt tty tya tyo typ tyr tyt yaa yab yao yap yar yat yay ybp ybr yby yob yoo yop yor yot yoy ypa ypo yra yro yrp yrt yta yto ytp ytr ytt yyb yyt yyy