-er a-a a-b a-i aaa aab aae aai aam aan aap aar ab- aba abb abe abi abm abn abp abr aea aeb aee aei aem aen aep aer ai- aia aib aie aii aim ain aip air ama amb ame ami amm amn amp amr an- ana anb ane ani anm ann anp anr ap- apa apb ape api apm apn app apr ar- ara arb are ari arm arn arp arr b-p baa bab bae bai bam ban bap bar bba bbb bbe bbi bbm bbn bbp bbr be- bea beb bee bei bem ben bep ber bi- bia bib bie bii bim bin bip bir bma bmb bme bmi bmm bmn bmp bmr bna bnb bne bni bnn bnp bnr bpa bpb bpe bpi bpm bpn bpp bpr bra brb bre bri brm brn brp brr eaa eab eae eai eam ean eap ear eba ebb ebe ebi ebm ebn ebp ebr eea eeb eee eem een eep eer eia eib eie eii eim ein eip eir em- ema emb eme emi emm emn emp emr en- ena enb ene eni enm enn enp enr ep- epa epb epe epi epm epn epp epr era erb ere eri erm ern erp err ia- iaa iab iae iai iam ian iap iar iba ibb ibe ibi ibm ibn ibp ibr ie- iea iee iei iem ien iep ier iia iib iie iii iim iin iip iir im- ima imb ime imi imm imn imp in- ina inb ine ini inm inn inp inr ipa ipb ipe ipi ipm ipn ipp ipr ir- ira irb ire iri irm irn irp irr m-r maa mab mae mai mam man map mar mba mbb mbe mbi mbm mbp mbr mea meb mee mei mem men mep mer mi- mia mib mie mii mim min mip mir mma mmb mme mmi mmm mmn mmp mmr mna mnb mne mni mnm mnn mnp mnr mpa mpb mpe mpi mpm mpn mpp mpr mra mrb mre mri mrm mrn mrp mrr n-i naa nab nae nai nam nan nap nar nba nbb nbe nbi nbm nbn nbp nbr ne- nea neb nee nei nem nen nep ner nia nib nie nii nim nin nip nir nma nmb nme nmi nmm nmn nmp nmr nna nnb nne nni nnm nnn nnp npa npb npe npi npm npn npp npr nra nrb nre nri nrm nrn nrp nrr p-p paa pab pae pai pam pan pap par pba pbb pbe pbi pbm pbn pbp pbr pea peb pee pei pem pen pep per pia pib pie pii pim pin pip pir pma pmb pme pmi pmm pmn pmp pmr pn- pna pnb pne pni pnm pnn pnp pnr ppa ppb ppe ppi ppm ppn ppp ppr pra prb pre pri prm prn prp prr ra- raa rab rae rai ram ran rap rar rba rbb rbe rbi rbm rbn rbp rbr re- rea reb ree rei rem ren rep rer ria rib rie rii rim rin rip rir rma rmb rme rmi rmm rmn rmp rmr rna rnb rni rnm rnn rnp rnr rpa rpb rpe rpi rpm rpn rpp rpr rra rrb rri rrm rrn rrp rrr