bbb bbe bbo bbs be- beb bee beo bes bez bob boe boo bos boz bsb bse bso bss bze bzo bzs bzz ebb ebe ebo ebs eeb eee eeo ees eo- eob eoe eoo eos es- esb ese eso ess eze ezo ezs ezz ob- obb obe obo obs oeb oee oeo oes oo- oob ooo oos os- osb ose oso oss oze ozo ozs ozz sbb sbe sbo sbs se- seb see seo ses sez sob soe soo sos soz ss- ssb sse sso sss ssz sze zbb zbs zeb zee zeo zes zez zo- zob zoe zoo zos zse zsz zzs zzz