b-p bbb bbd bbe bbi bbp bdb bdd bde bdi bdp be- beb bed bee bei bep bi- bib bid bie bii bip bpb bpd bpe bpi bpp dbb dbd dbe dbi dbp ddb ddd dde ddi ddp de- deb ded dee dei dep di- dib did die dii dip dpb dpd dpe dpi dpp ebb ebd ebe ebi ebp ed- edb edd ede edi edp eeb eed eee eep eib eid eie eii eip ep- epb epd epe epi epp i-d ibb ibd ibe ibi ibp idb idd ide idi idp ie- ied iee iei iep iib iid iie iii iip ipb ipd ipe ipi ipp p-p pbb pbd pbe pbi pbp pdb pdd pde pdi pdp peb ped pee pei pep pib pid pie pii pip ppb ppd ppe ppi ppp