a-a a-b aaa aab aad aan aao aap aar ab- aba abb abd abn abo abp abr ad- ada adb add adn ado adp adr an- ana anb and ann ano anp anr aoa aob aod aon aoo aop aor ap- apa apb apd apn apo app apr ar- ara arb ard arn aro arp arr b-p baa bab bad ban bao bap bar bba bbb bbd bbn bbo bbp bbr bda bdb bdd bdo bdp bdr bna bnb bnd bnn bno bnp bnr boa bob bod bon boo bop bor bpa bpb bpd bpn bpo bpp bpr bra brb brd brn bro brp brr daa dab dad dan dao dap dar dba dbb dbd dbn dbo dbp dbr dda ddb ddd ddn ddo ddp ddr dna dnb dnd dnn dno dnp dnr doa dob dod don doo dop dor dpa dpb dpd dpn dpo dpp dpr dra drb drd drn dro drp drr naa nab nad nan nao nap nar nba nbb nbd nbn nbo nbp nbr nda ndb ndd ndn ndo ndp ndr nna nnb nnn nno nnp no- noa nob nod non noo nop nor npa npb npd npn npo npp npr nra nrb nrd nrn nro nrp nrr oaa oab oad oan oao oap oar ob- oba obb obd obn obo obp obr oda odb odd odn odo odp odr on- ona onb ond onn ono onp onr oo- ooa oob ood oon ooo oop oor op- opa opb opd opn opo opp opr or- ora orb ord orn oro orp orr p-p paa pab pad pan pao pap par pba pbb pbd pbn pbo pbp pbr pda pdb pdd pdn pdo pdp pdr pn- pna pnb pnd pnn pno pnp pnr poa pob pod pon poo pop por ppa ppb ppd ppn ppo ppp ppr pra prb prd prn pro prp prr ra- raa rab rad ran rao rap rar rba rbb rbd rbn rbo rbp rbr rda rdb rdd rdn rdo rdp rdr rna rnb rnd rnn rno rnp rnr roa rob rod ron roo rop ror rpa rpb rpd rpn rpo rpp rpr rra rrb rrd rrn rrp rrr