a-a a-b a-i aaa aab aae aai aan aao aap aas ab- aba abb abe abi abn abo abp abs aea aeb aee aei aen aeo aep aes ai- aia aib aie aii ain aio aip ais an- ana anb ane ani ann ano anp ans aoa aob aoe aoi aon aoo aop aos ap- apa apb ape api apn apo app aps as- asa asb ase asi asn aso asp ass b-p baa bab bae bai ban bao bap bas bba bbb bbe bbi bbn bbo bbp bbs be- bea beb bee bei ben beo bep bes bi- bia bib bie bii bin bio bip bis bna bnb bne bni bnn bno bnp bns boa bob boe boi bon boo bop bos bpa bpb bpe bpi bpn bpo bpp bps bsa bsb bse bsi bsn bso bsp bss eaa eab eae eai ean eao eap eas eba ebb ebe ebi ebn ebo ebp ebs eea eeb eee een eeo eep ees eia eib eie eii ein eio eip eis en- ena enb ene eni enn eno enp ens eo- eoa eob eoe eoi eon eoo eop eos ep- epa epb epe epi epn epo epp eps es- esa esb ese esi esn eso esp ess ia- iaa iab iae iai ian iao iap ias iba ibb ibe ibi ibn ibo ibp ibs ie- iea iee iei ien iep ies iia iib iie iii iin iio iip iis in- ina inb ine ini inn ino inp ins io- ioa iob ioe ioi ion ioo iop ios ipa ipb ipe ipi ipn ipo ipp ips is- isa isb ise isi isn iso isp iss n-i naa nab nae nai nan nao nap nas nba nbb nbe nbi nbn nbo nbp nbs ne- nea neb nee nei nen neo nep nes nia nib nie nii nin nio nip nis nna nnb nne nni nnn nno nnp nns no- noa nob noe noi non noo nop nos npa npb npe npi npn npo npp nps nsa nsb nse nsi nsn nso nsp nss o-i oaa oab oae oai oan oao oap oas ob- oba obb obe obi obn obo obp obs oea oeb oee oei oen oeo oep oes oia oib oie oii oin oio oip ois on- ona onb one oni onn ono onp ons oo- ooa oob ooi oon ooo oop oos op- opa opb ope opi opn opo opp ops os- osa osb ose osi osn oso osp oss p-p paa pab pae pai pan pao pap pas pba pbb pbe pbi pbn pbo pbp pbs pea peb pee pei pen peo pep pes pia pib pie pii pin pio pip pis pn- pna pnb pne pni pnn pno pnp pns poa pob poe poi pon poo pop pos ppa ppb ppe ppi ppn ppo ppp pps ps- psa psb pse psi psn pso psp pss saa sab sae sai san sao sap sas sba sbb sbe sbi sbn sbo sbp sbs se- sea seb see sei sen seo sep ses sia sib sie sii sin sio sip sis sna snb sne sni snn sno snp sns soa sob soe soi son soo sop sos spa spb spe spi spn spo spp sps ss- ssa ssb sse ssi ssn sso ssp sss