b-p bbb bbo bbp bbq bbs bbt bob boo bop boq bos bot bpb bpo bpp bps bpt bqp bqt bsb bso bsp bss bst btb bto btp btq bts btt ob- obb obo obp obs obt oo- oob ooo oop oos oot op- opb opo opp opq ops opt oqb oqo os- osb oso osp osq oss ost ot- otb oto otp ots ott p-p pbb pbo pbp pbs pbt pob poo pop pos pot ppb ppo ppp ppq pps ppt pqq pqs ps- psb pso psp pss pst pt- ptb pto ptp ptq pts ptt qbq qbs qoo qop qos qpp qps qqq qso qsp qst qto qtq qts sbb sbo sbp sbq sbs sbt sob soo sop soq sos sot spb spo spp spq sps spt sqq sqs ss- ssb sso ssp ssq sss sst stb sto stp stq sts stt tbb tbo tbp tbs tbt to- tob too top toq tos tot tpb tpo tpp tpq tps tpt tqo tsb tso tsp tsq tss tst ttb tto ttp tts ttt