-er -ic a-a a-b a-c a-i aaa aab aac aae aaf aai aan aar ab- aba abb abc abe abf abi abn abr ac- aca acb acc ace acf aci acn acr aea aeb aec aee aef aei aen aer af- afa afb afc afe aff afi afn afr ai- aia aib aic aie aif aii ain air an- ana anb anc ane anf ani ann anr ar- ara arb arc are arf ari arn arr baa bab bac bae baf bai ban bar bba bbb bbc bbe bbf bbi bbn bbr bca bcb bcc bce bcf bci bcn bcr be- bea beb bec bee bef bei ben ber bfa bfb bfc bfe bff bfi bfn bfr bi- bia bib bic bie bif bii bin bir bna bnb bnc bne bnf bni bnn bnr bra brb bre brf bri brn brr c-- caa cab cac cae caf cai can car cba cbb cbc cbe cbf cbi cbn cbr cca ccb ccc cce ccf cci ccn ccr ce- cea ceb cec cee cef cei cen cer cfa cfb cfc cfe cff cfi cfn cfr ci- cia cib cic cie cif cii cin cir cn- cna cnb cnc cne cnf cni cnn cnr cra crb crc cre crf cri crn crr eaa eab eac eae eaf eai ean ear eba ebb ebc ebe ebf ebi ebn ebr ec- eca ecb ecc ece ecf eci ecn ecr eea eeb eec eee eef een eer ef- efa efb efc efe eff efi efr eia eib eic eie eif eii ein eir en- ena enb enc ene enf eni enn enr era erb erc ere erf eri ern err faa fab fac fae faf fai fan far fba fbb fbc fbe fbf fbi fbn fbr fca fcb fcc fce fcf fci fcn fcr fea feb fec fee fef fei fen fer ffa ffc ffe fff ffi ffn ffr fia fib fic fie fif fii fin fir fna fnb fnc fne fnf fni fnn fnr fra frb frc fre frf fri frn frr i-f ia- iaa iab iac iae iaf iai ian iar iba ibb ibc ibe ibf ibi ibn ibr ica icb icc ice icf ici icn icr ie- iea iec iee ief iei ien ier ifa ifb ifc ife iff ifi ifn ifr iia iib iic iie iif iii iin iir in- ina inb inc ine inf ini inn inr ir- ira irb irc ire irf iri irn irr n-i naa nab nac nae naf nai nan nar nba nbb nbc nbe nbf nbi nbn nbr nca ncb ncc nce ncf nci ncn ncr ne- nea neb nec nee nef nei nen ner nfa nfb nfc nfe nff nfi nfn nfr nia nib nic nie nif nii nin nir nna nnb nnc nne nnf nni nnn nra nrb nrc nre nrf nri nrn nrr ra- raa rab rac rae raf rai ran rar rba rbb rbc rbe rbf rbi rbn rbr rca rcb rcc rce rcf rci rcn rcr re- rea reb rec ree ref rei ren rer rfa rfb rfc rfe rff rfi rfn rfr ria rib ric rie rif rii rin rir rna rnb rnc rni rnn rnr rra rrb rrc rrf rri rrn rrr