bbb bbd bbo bbr bby bdb bdd bdo bdr bdy bdz bob bod boo bor boy boz brb brd bro brr bry brz by- byd byo byr byz bzd bzo bzr bzz dbb dbd dbo dbr dby dbz ddb ddd ddo ddr ddy ddz dob dod doo dor doy doz drb drd dro drr dry drz dy- dyb dyd dyo dyr dyy dzb dzd dzo dzr ob- obb obd obo obr oby odb odd odo odr oo- oob ood ooo oor or- orb ord oro orr ory orz oyd oyo ozo ozz rbb rbd rbo rbr rdb rdd rdo rdr rdy rob rod roo ror roy roz rrb rrd rrr ry- ryd ryo ryr ryy ryz rzb rzo rzy ybr yby ybz ydo ydy yob yod yoo yor yoy yro yyb yyy yyz yzb yzr yzy zbb zbr zby zo- zob zod zoo zor zro zzr zzy zzz