a-a a-b a-i aaa aab aae aaf aai aan aao aap ab- aba abb abe abf abi abn abo abp aea aeb aee aef aei aen aeo aep af- afa afb afe aff afi afn afo afp ai- aia aib aie aif aii ain aio aip an- ana anb ane anf ani ann ano anp aoa aob aoe aof aoi aon aoo aop ap- apa apb ape apf api apn apo app b-p baa bab bae baf bai ban bao bap bba bbb bbe bbf bbi bbn bbo bbp be- bea beb bee bef bei ben beo bep bfa bfb bfe bff bfi bfn bfo bfp bi- bia bib bie bif bii bin bio bip bna bnb bne bnf bni bnn bno bnp boa bob boe bof boi bon boo bop bpa bpb bpe bpf bpi bpn bpo bpp eaa eab eae eaf eai ean eao eap eba ebb ebe ebf ebi ebn ebo ebp eea eeb eee eef een eeo eep ef- efa efb efe eff efi efo efp eia eib eie eif eii ein eio eip en- ena enb ene enf eni enn eno enp eo- eoa eob eoe eof eoi eon eoo eop ep- epa epb epe epf epi epn epo epp faa fab fae faf fai fan fao fap fba fbb fbe fbf fbi fbn fbo fbp fea feb fee fef fei fen feo fep ffa ffe fff ffi ffn ffo ffp fia fib fie fif fii fin fip fna fnb fne fnf fni fnn fnp foa fob foe fof foi fon foo fop fpa fpb fpe fpi fpn fpo fpp i-f ia- iaa iab iae iaf iai ian iao iap iba ibb ibe ibf ibi ibn ibo ibp ie- iea iee ief iei ien iep ifa ifb ife iff ifi ifn ifo ifp iia iib iie iif iii iin iio iip in- ina inb ine inf ini inn ino inp io- ioa iob ioe iof ioi ion ioo iop ipa ipb ipe ipf ipi ipn ipo ipp n-i naa nab nae naf nai nan nao nap nba nbb nbe nbf nbi nbn nbo nbp ne- nea neb nee nef nei nen neo nep nfa nfb nfe nff nfi nfn nfo nfp nia nib nie nif nii nin nio nip nna nnb nne nnf nni nnn nno nnp no- noa nob noe nof noi non noo nop npa npb npe npf npi npn npo npp o-i oaa oab oae oaf oai oan oao oap ob- oba obb obe obf obi obn obo obp oea oeb oee oef oei oen oeo oep of- ofa ofb ofe off ofi ofn ofo ofp oia oib oie oif oii oin oio oip on- ona onb one onf oni onn ono onp oo- ooa oob oof ooi oon ooo oop op- opa opb ope opf opi opn opo opp p-p paa pab pae paf pai pan pao pap pba pbb pbe pbf pbi pbn pbo pbp pea peb pee pef pei pen peo pep pfa pfb pfe pff pfi pfn pfo pfp pia pib pie pif pii pin pio pip pn- pna pnb pne pnf pni pnn pno pnp poa pob poe pof poi pon poo pop ppa ppb ppe ppf ppi ppn ppo ppp