b-p bbb bbi bbp bbq bbs bbt bi- bib bii bip bis bit bpb bpi bpp bps bpt bqp bqt bsb bsi bsp bss bst btb bti btp btq bts btt ibb ibi ibp ibs ibt iib iii iip iis iit ipb ipi ipp ips ipt iqs iqt is- isb isi isp isq iss ist itb iti itp itq its itt p-p pbb pbi pbp pbs pbt pib pii pip piq pis pit ppb ppi ppp ppq pps ppt pqi pqq pqs ps- psb psi psp pss pst pt- ptb pti ptp ptq pts ptt qbq qbs qip qis qit qpp qps qqq qsi qsp qst qti qtq qts sbb sbi sbp sbq sbs sbt sib sii sip siq sis sit spb spi spp spq sps spt sqi sqq sqs ss- ssb ssi ssp ssq sss sst stb sti stp stq sts stt tbb tbi tbp tbs tbt tib tii tip tis tit tpb tpi tpp tpq tps tpt tsb tsi tsp tsq tss tst ttb tti ttp tts ttt