-er bbb bbd bbe bbo bbr bdb bdd bde bdo bdr bdz be- beb bed bee beo ber bez bob bod boe boo bor boz brb brd bre bro brr brz bzd bze bzo bzr bzz dbb dbd dbe dbo dbr dbz ddb ddd dde ddo ddr ddz de- deb ded dee deo der dez dob dod doe doo dor doz drb drd dre dro drr drz dzb dzd dze dzo dzr ebb ebd ebe ebo ebr ed- edb edd ede edo edr eeb eed eee eeo eer eo- eob eod eoe eoo eor erb erd ere ero err erz eze ezo ezr ezz ob- obb obd obe obo obr odb odd ode odo odr oeb oed oee oeo oer oo- oob ood ooo oor or- orb ord ore oro orr orz oze ozo ozz rbb rbd rbe rbo rbr rdb rdd rde rdo rdr re- reb red ree reo rer rez rob rod roe roo ror roz rrb rrd rrr rzb rze rzo zbb zbr zeb zed zee zeo zer zez zo- zob zod zoe zoo zor zro zzr zzz