b-p bbb bbe bbi bbp bbt be- beb bee bei bep bet bi- bib bie bii bip bit bpb bpe bpi bpp bpt btb bte bti btp btt ebb ebe ebi ebp ebt eeb eee eep eet eib eie eii eip eit ep- epb epe epi epp ept etb ete eti etp ett ibb ibe ibi ibp ibt ie- iee iei iep iet iib iie iii iip iit ipb ipe ipi ipp ipt itb ite iti itp itt p-p pbb pbe pbi pbp pbt peb pee pei pep pet pib pie pii pip pit ppb ppe ppi ppp ppt pt- ptb pte pti ptp ptt tbb tbe tbi tbp tbt te- teb tee tei tep tet tib tie tii tip tit tpb tpe tpi tpp tpt ttb tte tti ttp ttt