-er a-a a-b a-i aaa aab aae aaf aai aan aap aar ab- aba abb abe abf abi abn abp abr aea aeb aee aef aei aen aep aer af- afa afb afe aff afi afn afp afr ai- aia aib aie aif aii ain aip air an- ana anb ane anf ani ann anp anr ap- apa apb ape apf api apn app apr ar- ara arb are arf ari arn arp arr b-p baa bab bae baf bai ban bap bar bba bbb bbe bbf bbi bbn bbp bbr be- bea beb bee bef bei ben bep ber bfa bfb bfe bff bfi bfn bfp bfr bi- bia bib bie bif bii bin bip bir bna bnb bne bnf bni bnn bnp bnr bpa bpb bpe bpf bpi bpn bpp bpr bra brb bre brf bri brn brp brr eaa eab eae eaf eai ean eap ear eba ebb ebe ebf ebi ebn ebp ebr eea eeb eee eef een eep eer ef- efa efb efe eff efi efp efr eia eib eie eif eii ein eip eir en- ena enb ene enf eni enn enp enr ep- epa epb epe epf epi epn epp epr era erb ere erf eri ern erp err faa fab fae faf fai fan fap far fba fbb fbe fbf fbi fbn fbp fbr fea feb fee fef fei fen fep fer ffa ffe fff ffi ffn ffp ffr fia fib fie fif fii fin fip fir fna fnb fne fnf fni fnn fnp fnr fpa fpb fpe fpi fpn fpp fpr fra frb fre frf fri frn frp frr i-f ia- iaa iab iae iaf iai ian iap iar iba ibb ibe ibf ibi ibn ibp ibr ie- iea iee ief iei ien iep ier ifa ifb ife iff ifi ifn ifp ifr iia iib iie iif iii iin iip iir in- ina inb ine inf ini inn inp inr ipa ipb ipe ipf ipi ipn ipp ipr ir- ira irb ire irf iri irn irp irr n-i naa nab nae naf nai nan nap nar nba nbb nbe nbf nbi nbn nbp nbr ne- nea neb nee nef nei nen nep ner nfa nfb nfe nff nfi nfn nfp nfr nia nib nie nif nii nin nip nir nna nnb nne nnf nni nnn nnp npa npb npe npf npi npn npp npr nra nrb nre nrf nri nrn nrp nrr p-p paa pab pae paf pai pan pap par pba pbb pbe pbf pbi pbn pbp pbr pea peb pee pef pei pen pep per pfa pfb pfe pff pfi pfn pfp pfr pia pib pie pif pii pin pip pir pn- pna pnb pne pnf pni pnn pnp pnr ppa ppb ppe ppf ppi ppn ppp ppr pra prb pre prf pri prn prp prr ra- raa rab rae raf rai ran rap rar rba rbb rbe rbf rbi rbn rbp rbr re- rea reb ree ref rei ren rep rer rfa rfb rfe rff rfi rfn rfp rfr ria rib rie rif rii rin rip rir rna rnb rni rnn rnp rnr rpa rpb rpe rpf rpi rpn rpp rpr rra rrb rrf rri rrn rrp rrr