b-p bbb bbe bbo bbp bbs bbx be- beb bee beo bep bes bex bob boe boo bop bos box bpb bpe bpo bpp bps bpx bsb bse bso bsp bss bsx bxb bxo bxx ebb ebe ebo ebp ebs ebx eeb eee eeo eep ees eex eo- eob eoe eoo eop eos ep- epb epe epo epp eps epx es- esb ese eso esp ess esx ex- exe exo exp exs exx ob- obb obe obo obp obs obx oeb oee oeo oep oes oex oo- oob ooo oop oos oox op- opb ope opo opp ops opx os- osb ose oso osp oss osx ox- oxb oxo oxx p-p pbb pbe pbo pbp pbs pbx peb pee peo pep pes pex pob poe poo pop pos pox ppb ppe ppo ppp pps ppx ps- psb pse pso psp pss psx pxe pxs sbb sbe sbo sbp sbs sbx se- seb see seo sep ses sex sob soe soo sop sos sox spb spe spo spp sps spx ss- ssb sse sso ssp sss ssx sxs xbe xbx xee xep xes xex xoo xop xos xox xpb xpe xpo xpp xps xsb xsp xss xxo xxp xxx