-er a-a a-b a-i aaa aab aae aai aan aap aar ab- aba abb abe abi abn abp abr aea aeb aee aei aen aep aer ai- aia aib aie aii ain aip air an- ana anb ane ani ann anp anr ap- apa apb ape api apn app apr ar- ara arb are ari arn arp arr b-p baa bab bae bai ban bap bar bba bbb bbe bbi bbn bbp bbr be- bea beb bee bei ben bep ber bi- bia bib bie bii bin bip bir bna bnb bne bni bnn bnp bnr bpa bpb bpe bpi bpn bpp bpr bra brb bre bri brn brp brr eaa eab eae eai ean eap ear eba ebb ebe ebi ebn ebp ebr eea eeb eee een eep eer eia eib eie eii ein eip eir en- ena enb ene eni enn enp enr ep- epa epb epe epi epn epp epr era erb ere eri ern erp err ia- iaa iab iae iai ian iap iar iba ibb ibe ibi ibn ibp ibr ie- iea iee iei ien iep ier iia iib iie iii iin iip iir in- ina inb ine ini inn inp inr ipa ipb ipe ipi ipn ipp ipr ir- ira irb ire iri irn irp irr n-i naa nab nae nai nan nap nar nba nbb nbe nbi nbn nbp nbr ne- nea neb nee nei nen nep ner nia nib nie nii nin nip nir nna nnb nne nni nnn nnp npa npb npe npi npn npp npr nra nrb nre nri nrn nrp nrr p-p paa pab pae pai pan pap par pba pbb pbe pbi pbn pbp pbr pea peb pee pei pen pep per pia pib pie pii pin pip pir pn- pna pnb pne pni pnn pnp pnr ppa ppb ppe ppi ppn ppp ppr pra prb pre pri prn prp prr ra- raa rab rae rai ran rap rar rba rbb rbe rbi rbn rbp rbr re- rea reb ree rei ren rep rer ria rib rie rii rin rip rir rna rnb rni rnn rnp rnr rpa rpb rpe rpi rpn rpp rpr rra rrb rri rrn rrp rrr