a-a a-b a-i aaa aab aai aam aan aao aap aar ab- aba abb abi abm abn abo abp abr ai- aia aib aii aim ain aio aip air ama amb ami amm amn amo amp amr an- ana anb ani anm ann ano anp anr aoa aob aoi aom aon aoo aop aor ap- apa apb api apm apn apo app apr ar- ara arb ari arm arn aro arp arr b-p baa bab bai bam ban bao bap bar bba bbb bbi bbm bbn bbo bbp bbr bi- bia bib bii bim bin bio bip bir bma bmb bmi bmm bmn bmo bmp bmr bna bnb bni bnn bno bnp bnr boa bob boi bom bon boo bop bor bpa bpb bpi bpm bpn bpo bpp bpr bra brb bri brm brn bro brp brr ia- iaa iab iai iam ian iao iap iar iba ibb ibi ibm ibn ibo ibp ibr iia iib iii iim iin iio iip iir im- ima imb imi imm imn imo imp in- ina inb ini inm inn ino inp inr io- ioa iob ioi iom ion ioo iop ior ipa ipb ipi ipm ipn ipo ipp ipr ir- ira irb iri irm irn iro irp irr m-o m-r maa mab mai mam man mao map mar mba mbb mbi mbm mbo mbp mbr mi- mia mib mii mim min mio mip mir mma mmb mmi mmm mmn mmo mmp mmr mna mnb mni mnm mnn mno mnp mnr moa mob moi mom mon moo mop mor mpa mpb mpi mpm mpn mpo mpp mpr mra mrb mri mrm mrn mro mrp mrr n-i naa nab nai nam nan nao nap nar nba nbb nbi nbm nbn nbo nbp nbr nia nib nii nim nin nio nip nir nma nmb nmi nmm nmn nmo nmp nmr nna nnb nni nnm nnn nno nnp no- noa nob noi nom non noo nop nor npa npb npi npm npn npo npp npr nra nrb nri nrm nrn nro nrp nrr o-i oaa oab oai oam oan oao oap oar ob- oba obb obi obm obn obo obp obr oia oib oii oim oin oio oip oir om- oma omb omi omm omn omo omp omr on- ona onb oni onn ono onp onr oo- ooa oob ooi oom oon ooo oop oor op- opa opb opi opm opn opo opp opr or- ora orb ori orm orn oro orp orr p-p paa pab pai pam pan pao pap par pba pbb pbi pbm pbn pbo pbp pbr pia pib pii pim pin pio pip pir pma pmb pmi pmm pmn pmo pmp pmr pn- pna pnb pni pnm pnn pno pnp pnr poa pob poi pom pon poo pop por ppa ppb ppi ppm ppn ppo ppp ppr pra prb pri prm prn pro prp prr ra- raa rab rai ram ran rao rap rar rba rbb rbi rbm rbn rbo rbp rbr ria rib rii rim rin rio rip rir rma rmb rmi rmm rmn rmo rmp rmr rna rnb rni rnm rnn rno rnp rnr roa rob roi rom ron roo rop ror rpa rpb rpi rpm rpn rpo rpp rpr rra rrb rri rrm rrn rrp rrr