b-p bbb bbc bbp bbr bbs bby bcb bcc bcp bcr bcs bcy bpb bpc bpp bpr bps bpy brb brp brr brs bry bsb bsc bsp bsr bss bsy by- byc byp byr bys c-- cbb cbc cbp cbr cbs cby ccb ccc ccp ccr ccs cpb cpc cpp cpr cps crb crc crp crr crs cry csb csc csp csr css csy cyb cyc cyp cyr cys p-p pbb pbc pbp pbr pbs pby pcb pcc pcp pcr pcs ppb ppc ppp ppr pps prb prc prp prr prs pry ps- psb psc psp psr pss psy py- pyb pyc pyr pys rbb rbc rbp rbr rbs rcb rcc rcp rcr rcs rpb rpc rpp rpr rps rrb rrc rrp rrr rrs rsb rsc rsp rsr rss ry- ryc ryr rys ryy sbb sbc sbp sbr sbs sby scb scc scp scr scs spb spc spp spr sps spy sr- srb src srp srr srs sry ss- ssb ssc ssp ssr sss sy- syb syc syp syr sys ybc ybp ybr ybs yby ycc ycp ycs ycy yps yrc yrp yrs ysb ysc ysp ysr yss ysy yyb yyc yys yyy