b-p bbb bbd bbo bbp bby bdb bdd bdo bdp bdy bob bod boo bop boy bpb bpd bpo bpp bpy by- byd byo byp dbb dbd dbo dbp dby ddb ddd ddo ddp ddy dob dod doo dop doy dpb dpd dpo dpp dy- dyb dyd dyo dyp dyy ob- obb obd obo obp oby odb odd odo odp oo- oob ood ooo oop op- opb opd opo opp opy oyd oyo p-p pbb pbd pbo pbp pby pdb pdd pdo pdp pob pod poo pop poy ppb ppd ppo ppp py- pyb pyd pyo ybp yby ydo ydy yob yod yoo yop yoy ypd ypo yyb yyy