a-a a-b a-i aaa aab aai aam aao aap aar aax ab- aba abb abi abm abo abp abr abx ai- aia aib aii aim aio aip air aix ama amb ami amm amo amp amr amx aoa aob aoi aom aoo aop aor aox ap- apa apb api apm apo app apr apx ar- ara arb ari arm aro arp arr arx ax- axa axi axm axo axp axr axx b-p baa bab bai bam bao bap bar bax bba bbb bbi bbm bbo bbp bbr bbx bi- bia bib bii bim bio bip bir bix bma bmb bmi bmm bmo bmp bmr bmx boa bob boi bom boo bop bor box bpa bpb bpi bpm bpo bpp bpr bpx bra brb bri brm bro brp brr brx bxb bxi bxm bxo bxx ia- iaa iab iai iam iao iap iar iba ibb ibi ibm ibo ibp ibr ibx iia iib iii iim iio iip iir iix im- ima imb imi imm imo imp imx io- ioa iob ioi iom ioo iop ior ipa ipb ipi ipm ipo ipp ipr ipx ir- ira irb iri irm iro irp irr irx ixi m-o m-r maa mab mai mam mao map mar max mba mbb mbi mbm mbo mbp mbr mbx mi- mia mib mii mim mio mip mir mix mma mmb mmi mmm mmo mmp mmr mmx moa mob moi mom moo mop mor mox mpa mpb mpi mpm mpo mpp mpr mpx mra mrb mri mrm mro mrp mrr mrx mxa mxi mxp mxr o-i oaa oab oai oam oao oap oar oax ob- oba obb obi obm obo obp obr obx oia oib oii oim oio oip oir om- oma omb omi omm omo omp omr omx oo- ooa oob ooi oom ooo oop oor oox op- opa opb opi opm opo opp opr opx or- ora orb ori orm oro orp orr orx ox- oxa oxb oxi oxo oxx p-p paa pab pai pam pao pap par pax pba pbb pbi pbm pbo pbp pbr pbx pia pib pii pim pio pip pir pix pma pmb pmi pmm pmo pmp pmr pmx poa pob poi pom poo pop por pox ppa ppb ppi ppm ppo ppp ppr ppx pra prb pri prm pro prp prr prx pxm pxr ra- raa rab rai ram rao rap rar rax rba rbb rbi rbm rbo rbp rbr rbx ria rib rii rim rio rip rir rix rma rmb rmi rmm rmo rmp rmr rmx roa rob roi rom roo rop ror rox rpa rpb rpi rpm rpo rpp rpr rpx rra rrb rri rrm rrp rrr rxp rxr xaa xam xap xar xbr xbx xia xii xio xix xma xmi xmm xmo xmp xmr xmx xoa xoi xom xoo xop xor xox xpa xpb xpm xpo xpp xrx xxi xxo xxp xxx