b-p bbb bbo bbp bbs bbt bby bob boo bop bos bot boy bpb bpo bpp bps bpt bpy bsb bso bsp bss bst bsy btb bto btp bts btt bty by- byo byp bys byt ob- obb obo obp obs obt oby oo- oob ooo oop oos oot op- opb opo opp ops opt opy os- osb oso osp oss ost ot- otb oto otp ots ott oyo oys p-p pbb pbo pbp pbs pbt pby pob poo pop pos pot poy ppb ppo ppp pps ppt ps- psb pso psp pss pst psy pt- ptb pto ptp pts ptt pty py- pyb pyo pys pyt sbb sbo sbp sbs sbt sby sob soo sop sos sot soy spb spo spp sps spt spy ss- ssb sso ssp sss sst stb sto stp sts stt sty sy- syb syp sys syt tbb tbo tbp tbs tbt to- tob too top tos tot toy tpb tpo tpp tps tpt tsb tso tsp tss tst tsy ttb tto ttp tts ttt tty tyo typ tys tyt ybp ybs yby yob yoo yop yos yot yoy ypo yps ysb yso ysp yss yst ysy yto ytp yts ytt yyb yys yyt yyy