bbb bbd bbe bbo bdb bdd bde bdo bdz be- beb bed bee beo bez bob bod boe boo boz bzd bze bzo bzz dbb dbd dbe dbo dbz ddb ddd dde ddo ddz de- deb ded dee deo dez dob dod doe doo doz dzb dzd dze dzo ebb ebd ebe ebo ed- edb edd ede edo eeb eed eee eeo eo- eob eod eoe eoo eze ezo ezz ob- obb obd obe obo odb odd ode odo oeb oed oee oeo oo- oob ood ooo oze ozo ozz zbb zeb zed zee zeo zez zo- zob zod zoe zoo zzz