a-a a-b aaa aab aae aam aan aao aap aas ab- aba abb abe abm abn abo abp abs aea aeb aee aem aen aeo aep aes ama amb ame amm amn amo amp ams an- ana anb ane anm ann ano anp ans aoa aob aoe aom aon aoo aop aos ap- apa apb ape apm apn apo app aps as- asa asb ase asm asn aso asp ass b-p baa bab bae bam ban bao bap bas bba bbb bbe bbm bbn bbo bbp bbs be- bea beb bee bem ben beo bep bes bma bmb bme bmm bmn bmo bmp bms bna bnb bne bnn bno bnp bns boa bob boe bom bon boo bop bos bpa bpb bpe bpm bpn bpo bpp bps bsa bsb bse bsm bsn bso bsp bss eaa eab eae eam ean eao eap eas eba ebb ebe ebm ebn ebo ebp ebs eea eeb eee eem een eeo eep ees em- ema emb eme emm emn emo emp ems en- ena enb ene enm enn eno enp ens eo- eoa eob eoe eom eon eoo eop eos ep- epa epb epe epm epn epo epp eps es- esa esb ese esm esn eso esp ess m-o maa mab mae mam man mao map mas mba mbb mbe mbm mbo mbp mbs mea meb mee mem men meo mep mes mma mmb mme mmm mmn mmo mmp mms mna mnb mne mnm mnn mno mnp mns moa mob moe mom mon moo mop mos mpa mpb mpe mpm mpn mpo mpp mps msa msb mse msm msn mso msp mss naa nab nae nam nan nao nap nas nba nbb nbe nbm nbn nbo nbp nbs ne- nea neb nee nem nen neo nep nes nma nmb nme nmm nmn nmo nmp nms nna nnb nne nnm nnn nno nnp nns no- noa nob noe nom non noo nop nos npa npb npe npm npn npo npp nps nsa nsb nse nsm nsn nso nsp nss oaa oab oae oam oan oao oap oas ob- oba obb obe obm obn obo obp obs oea oeb oee oem oen oeo oep oes om- oma omb ome omm omn omo omp oms on- ona onb one onn ono onp ons oo- ooa oob oom oon ooo oop oos op- opa opb ope opm opn opo opp ops os- osa osb ose osm osn oso osp oss p-p paa pab pae pam pan pao pap pas pba pbb pbe pbm pbn pbo pbp pbs pea peb pee pem pen peo pep pes pma pmb pme pmm pmn pmo pmp pms pn- pna pnb pne pnm pnn pno pnp pns poa pob poe pom pon poo pop pos ppa ppb ppe ppm ppn ppo ppp pps ps- psa psb pse psm psn pso psp pss saa sab sae sam san sao sap sas sba sbb sbe sbm sbn sbo sbp sbs se- sea seb see sem sen seo sep ses sma smb sme smm smn smo smp sms sna snb sne snm snn sno snp sns soa sob soe som son soo sop sos spa spb spe spm spn spo spp sps ss- ssa ssb sse ssm ssn sso ssp sss