a-a a-b a-i aaa aab aai aam aan aao aap ab- aba abb abi abm abn abo abp ai- aia aib aii aim ain aio aip ama amb ami amm amn amo amp an- ana anb ani anm ann ano anp aoa aob aoi aom aon aoo aop ap- apa apb api apm apn apo app b-p baa bab bai bam ban bao bap bba bbb bbi bbm bbn bbo bbp bi- bia bib bii bim bin bio bip bma bmb bmi bmm bmn bmo bmp bna bnb bni bnn bno bnp boa bob boi bom bon boo bop bpa bpb bpi bpm bpn bpo bpp ia- iaa iab iai iam ian iao iap iba ibb ibi ibm ibn ibo ibp iia iib iii iim iin iio iip im- ima imb imi imm imn imo imp in- ina inb ini inm inn ino inp io- ioa iob ioi iom ion ioo iop ipa ipb ipi ipm ipn ipo ipp m-o maa mab mai mam man mao map mba mbb mbi mbm mbo mbp mi- mia mib mii mim min mio mip mma mmb mmi mmm mmn mmo mmp mna mnb mni mnm mnn mno mnp moa mob moi mom mon moo mop mpa mpb mpi mpm mpn mpo mpp n-i naa nab nai nam nan nao nap nba nbb nbi nbm nbn nbo nbp nia nib nii nim nin nio nip nma nmb nmi nmm nmn nmo nmp nna nnb nni nnm nnn nno nnp no- noa nob noi nom non noo nop npa npb npi npm npn npo npp o-i oaa oab oai oam oan oao oap ob- oba obb obi obm obn obo obp oia oib oii oim oin oio oip om- oma omb omi omm omn omo omp on- ona onb oni onn ono onp oo- ooa oob ooi oom oon ooo oop op- opa opb opi opm opn opo opp p-p paa pab pai pam pan pao pap pba pbb pbi pbm pbn pbo pbp pia pib pii pim pin pio pip pma pmb pmi pmm pmn pmo pmp pn- pna pnb pni pnm pnn pno pnp poa pob poi pom pon poo pop ppa ppb ppi ppm ppn ppo ppp