a-a a-b aaa aab aag aam aan aao aap aar ab- aba abb abg abm abn abo abp abr ag- aga agb agg agm agn ago agp agr ama amb amg amm amn amo amp amr an- ana anb ang anm ann ano anp anr aoa aob aog aom aon aoo aop aor ap- apa apb apg apm apn apo app apr ar- ara arb arg arm arn aro arp arr b-p baa bab bag bam ban bao bap bar bba bbb bbg bbm bbn bbo bbp bbr bga bgb bgg bgm bgn bgo bgp bgr bma bmb bmg bmm bmn bmo bmp bmr bna bnb bng bnn bno bnp bnr boa bob bog bom bon boo bop bor bpa bpb bpg bpm bpn bpo bpp bpr bra brb brg brm brn bro brp brr g-p gaa gab gag gam gan gao gap gar gba gbg gbm gbn gbo gbp gbr gga ggb ggg ggm ggn ggo ggp ggr gma gmb gmg gmm gmn gmo gmp gmr gna gnb gnm gnn gno gnp gnr goa gob gog gom gon goo gop gor gpa gpb gpg gpm gpn gpo gpp gpr gra grb grg grm grn gro grp grr m-o m-r maa mab mag mam man mao map mar mba mbb mbg mbm mbo mbp mbr mga mgb mgm mgn mgo mgp mgr mma mmb mmg mmm mmn mmo mmp mmr mna mnb mng mnm mnn mno mnp mnr moa mob mog mom mon moo mop mor mpa mpb mpg mpm mpn mpo mpp mpr mra mrb mrg mrm mrn mro mrp mrr naa nab nag nam nan nao nap nar nba nbb nbg nbm nbn nbo nbp nbr nga ngb ngg ngm ngn ngo ngp nma nmb nmg nmm nmn nmo nmp nmr nna nnb nng nnm nnn nno nnp no- noa nob nog nom non noo nop nor npa npb npg npm npn npo npp npr nra nrb nrg nrm nrn nro nrp nrr oaa oab oag oam oan oao oap oar ob- oba obb obg obm obn obo obp obr oga ogg ogn ogo ogp om- oma omb omg omm omn omo omp omr on- ona onb ong onn ono onp onr oo- ooa oob oog oom oon ooo oop oor op- opa opb opg opm opn opo opp opr or- ora orb org orm orn oro orp orr p-p paa pab pag pam pan pao pap par pba pbb pbg pbm pbn pbo pbp pbr pga pgb pgg pgm pgn pgo pgp pgr pma pmb pmg pmm pmn pmo pmp pmr pn- pna pnb png pnm pnn pno pnp pnr poa pob pog pom pon poo pop por ppa ppb ppg ppm ppn ppo ppp ppr pra prb prg prm prn pro prp prr ra- raa rab rag ram ran rao rap rar rba rbb rbg rbm rbn rbo rbp rbr rga rgb rgg rgn rgo rgp rgr rma rmb rmg rmm rmn rmo rmp rmr rna rnb rng rnm rnn rno rnp rnr roa rob rog rom ron roo rop ror rpa rpb rpg rpm rpn rpo rpp rpr rra rrb rrg rrm rrn rrp rrr