a-a a-b a-i aaa aab aad aae aai aap ab- aba abb abd abe abi abp ad- ada adb add ade adi adp aea aeb aed aee aei aep ai- aia aib aid aie aii aip ap- apa apb apd ape api app b-p baa bab bad bae bai bap bba bbb bbd bbe bbi bbp bda bdb bdd bde bdi bdp be- bea beb bed bee bei bep bi- bia bib bid bie bii bip bpa bpb bpd bpe bpi bpp daa dab dad dae dai dap dba dbb dbd dbe dbi dbp dda ddb ddd dde ddi ddp de- dea deb ded dee dei dep di- dia dib did die dii dip dpa dpb dpd dpe dpi dpp eaa eab ead eae eai eap eba ebb ebd ebe ebi ebp ed- eda edb edd ede edi edp eea eeb eed eee eep eia eib eid eie eii eip ep- epa epb epd epe epi epp i-d ia- iaa iab iad iae iai iap iba ibb ibd ibe ibi ibp ida idb idd ide idi idp ie- iea ied iee iei iep iia iib iid iie iii iip ipa ipb ipd ipe ipi ipp p-p paa pab pad pae pai pap pba pbb pbd pbe pbi pbp pda pdb pdd pde pdi pdp pea peb ped pee pei pep pia pib pid pie pii pip ppa ppb ppd ppe ppi ppp