a-a a-b a-c aaa aab aac aad aag aao aap ab- aba abb abc abd abg abo abp ac- aca acb acc acd acg aco acp ad- ada adb adc add adg ado adp ag- aga agb agc agd agg ago agp aoa aob aoc aod aog aoo aop ap- apa apb apc apd apg apo app b-p baa bab bac bad bag bao bap bba bbb bbc bbd bbg bbo bbp bca bcb bcc bcd bcg bco bcp bda bdb bdc bdd bdg bdo bdp bga bgb bgc bgd bgg bgo bgp boa bob boc bod bog boo bop bpa bpb bpc bpd bpg bpo bpp c-- caa cab cac cad cag cao cap cba cbb cbc cbd cbg cbo cbp cca ccb ccc ccd ccg cco ccp cda cdb cdc cdd cdg cdo cdp cga cgb cgc cgd cgg cgo cgp co- coa cob coc cod cog coo cop cpa cpb cpc cpd cpg cpo cpp daa dab dac dad dag dao dap dba dbb dbc dbd dbg dbo dbp dca dcb dcc dcd dcg dco dcp dda ddb ddc ddd ddg ddo ddp dga dgc dgd dgg dgp doa dob doc dod dog doo dop dpa dpb dpc dpd dpg dpo dpp g-d g-p gaa gab gac gad gag gao gap gba gbc gbd gbg gbo gbp gca gcb gcc gcd gcg gco gcp gda gdb gdc gdd gdo gdp gga ggb ggc ggd ggg ggo ggp goa gob goc god gog goo gop gpa gpb gpc gpd gpg gpo gpp oaa oab oac oad oag oao oap ob- oba obb obc obd obg obo obp oc- oca ocb occ ocd ocg oco ocp oda odb odc odd odg odo odp oga ogc ogd ogg ogo ogp oo- ooa oob ooc ood oog ooo oop op- opa opb opc opd opg opo opp p-p paa pab pac pad pag pao pap pba pbb pbc pbd pbg pbo pbp pca pcb pcc pcd pcg pco pcp pda pdb pdc pdd pdg pdo pdp pga pgb pgc pgd pgg pgo pgp poa pob poc pod pog poo pop ppa ppb ppc ppd ppg ppo ppp