a-a a-b a-i aaa aab aai aam aap ab- aba abb abi abm abp ai- aia aib aii aim aip ama amb ami amm amp ap- apa apb api apm app b-p baa bab bai bam bap bba bbb bbi bbm bbp bi- bia bib bii bim bip bma bmb bmi bmm bmp bpa bpb bpi bpm bpp ia- iaa iab iai iam iap iba ibb ibi ibm ibp iia iib iii iim iip im- ima imb imi imm imp ipa ipb ipi ipm ipp maa mab mai mam map mba mbb mbi mbm mbp mi- mia mib mii mim mip mma mmb mmi mmm mmp mpa mpb mpi mpm mpp p-p paa pab pai pam pap pba pbb pbi pbm pbp pia pib pii pim pip pma pmb pmi pmm pmp ppa ppb ppi ppm ppp