a-a a-b a-c aaa aab aac aad aag aao aap aar ab- aba abb abc abd abg abo abp abr ac- aca acb acc acd acg aco acp acr ad- ada adb adc add adg ado adp adr ag- aga agb agc agd agg ago agp agr aoa aob aoc aod aog aoo aop aor ap- apa apb apc apd apg apo app apr ar- ara arb arc ard arg aro arp arr b-p baa bab bac bad bag bao bap bar bba bbb bbc bbd bbg bbo bbp bbr bca bcb bcc bcd bcg bco bcp bcr bda bdb bdc bdd bdg bdo bdp bdr bga bgb bgc bgd bgg bgo bgp bgr boa bob boc bod bog boo bop bor bpa bpb bpc bpd bpg bpo bpp bpr bra brb brd brg bro brp brr c-- caa cab cac cad cag cao cap car cba cbb cbc cbd cbg cbo cbp cbr cca ccb ccc ccd ccg cco ccp ccr cda cdb cdc cdd cdg cdo cdp cdr cga cgb cgc cgd cgg cgo cgp cgr co- coa cob coc cod cog coo cop cor cpa cpb cpc cpd cpg cpo cpp cpr cra crb crc crd crg cro crp crr daa dab dac dad dag dao dap dar dba dbb dbc dbd dbg dbo dbp dbr dca dcb dcc dcd dcg dco dcp dcr dda ddb ddc ddd ddg ddo ddp ddr dga dgc dgd dgg dgp dgr doa dob doc dod dog doo dop dor dpa dpb dpc dpd dpg dpo dpp dpr dra drb drc drd drg dro drp drr g-d g-p gaa gab gac gad gag gao gap gar gba gbc gbd gbg gbo gbp gbr gca gcb gcc gcd gcg gco gcp gcr gda gdb gdc gdd gdo gdp gdr gga ggb ggc ggd ggg ggo ggp ggr goa gob goc god gog goo gop gor gpa gpb gpc gpd gpg gpo gpp gpr gra grb grc grd grg gro grp grr oaa oab oac oad oag oao oap oar ob- oba obb obc obd obg obo obp obr oc- oca ocb occ ocd ocg oco ocp ocr oda odb odc odd odg odo odp odr oga ogc ogd ogg ogo ogp oo- ooa oob ooc ood oog ooo oop oor op- opa opb opc opd opg opo opp opr or- ora orb orc ord org oro orp orr p-p paa pab pac pad pag pao pap par pba pbb pbc pbd pbg pbo pbp pbr pca pcb pcc pcd pcg pco pcp pcr pda pdb pdc pdd pdg pdo pdp pdr pga pgb pgc pgd pgg pgo pgp pgr poa pob poc pod pog poo pop por ppa ppb ppc ppd ppg ppo ppp ppr pra prb prc prd prg pro prp prr ra- raa rab rac rad rag rao rap rar rba rbb rbc rbd rbg rbo rbp rbr rca rcb rcc rcd rcg rco rcp rcr rda rdb rdc rdd rdg rdo rdp rdr rga rgb rgc rgd rgg rgo rgp rgr roa rob roc rod rog roo rop ror rpa rpb rpc rpd rpg rpo rpp rpr rra rrb rrc rrd rrg rrp rrr