a-a a-b a-c aaa aab aac aad aag aao aap aay ab- aba abb abc abd abg abo abp aby ac- aca acb acc acd acg aco acp acy ad- ada adb adc add adg ado adp ady ag- aga agb agc agd agg ago agp agy aoa aob aoc aod aog aoo aop ap- apa apb apc apd apg apo app apy ay- aya ayc ayd ayo ayp b-p baa bab bac bad bag bao bap bay bba bbb bbc bbd bbg bbo bbp bby bca bcb bcc bcd bcg bco bcp bcy bda bdb bdc bdd bdg bdo bdp bdy bga bgb bgc bgd bgg bgo bgp boa bob boc bod bog boo bop boy bpa bpb bpc bpd bpg bpo bpp bpy by- bya byc byd byg byo byp c-- caa cab cac cad cag cao cap cay cba cbb cbc cbd cbg cbo cbp cby cca ccb ccc ccd ccg cco ccp cda cdb cdc cdd cdg cdo cdp cdy cga cgb cgc cgd cgg cgo cgp cgy co- coa cob coc cod cog coo cop coy cpa cpb cpc cpd cpg cpo cpp cya cyb cyc cyd cyg cyo cyp daa dab dac dad dag dao dap day dba dbb dbc dbd dbg dbo dbp dby dca dcb dcc dcd dcg dco dcp dda ddb ddc ddd ddg ddo ddp ddy dga dgc dgd dgg dgp doa dob doc dod dog doo dop doy dpa dpb dpc dpd dpg dpo dpp dy- dya dyb dyc dyd dyo dyp dyy g-d g-p gaa gab gac gad gag gao gap gay gba gbc gbd gbg gbo gbp gby 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 goy gpa gpb gpc gpd gpg gpo gpp gy- gya gyb gyd gyo gyp oaa oab oac oad oag oao oap ob- oba obb obc obd obg obo obp oby oc- oca ocb occ ocd ocg oco ocp oda odb odc odd odg odo odp oga ogc ogd ogg ogo ogp ogy oo- ooa oob ooc ood oog ooo oop op- opa opb opc opd opg opo opp opy oya oyd oyo p-p paa pab pac pad pag pao pap pay pba pbb pbc pbd pbg pbo pbp pby pca pcb pcc pcd pcg pco pcp pda pdb pdc pdd pdg pdo pdp pga pgb pgc pgd pgg pgo pgp pgy poa pob poc pod pog poo pop poy ppa ppb ppc ppd ppg ppo ppp py- pya pyb pyc pyd pyg pyo yaa yab yac yad yag yao yap yay ybc ybg ybp yby yca ycc ycd yco ycp ycy yda ydg ydo ydy yga ygc ygo yob yoc yod yog yoo yop yoy ypa ypd ypg ypo yyb yyc yyg yyy