-er -ic a-a a-b a-c a-i aaa aab aac aae aai aan aar ab- aba abb abc abe abi abn abr ac- aca acb acc ace aci acn acr aea aeb aec aee aei aen aer ai- aia aib aic aie aii ain air an- ana anb anc ane ani ann anr ar- ara arb arc are ari arn arr baa bab bac bae bai ban bar bba bbb bbc bbe bbi bbn bbr bca bcb bcc bce bci bcn bcr be- bea beb bec bee bei ben ber bi- bia bib bic bie bii bin bir bna bnb bnc bne bni bnn bnr bra brb bre bri brn brr c-- caa cab cac cae cai can car cba cbb cbc cbe cbi cbn cbr cca ccb ccc cce cci ccn ccr ce- cea ceb cec cee cei cen cer ci- cia cib cic cie cii cin cir cn- cna cnb cnc cne cni cnn cnr cra crb crc cre cri crn crr eaa eab eac eae eai ean ear eba ebb ebc ebe ebi ebn ebr ec- eca ecb ecc ece eci ecn ecr eea eeb eec eee een eer eia eib eic eie eii ein eir en- ena enb enc ene eni enn enr era erb erc ere eri ern err ia- iaa iab iac iae iai ian iar iba ibb ibc ibe ibi ibn ibr ica icb icc ice ici icn icr ie- iea iec iee iei ien ier iia iib iic iie iii iin iir in- ina inb inc ine ini inn inr ir- ira irb irc ire iri irn irr n-i naa nab nac nae nai nan nar nba nbb nbc nbe nbi nbn nbr nca ncb ncc nce nci ncn ncr ne- nea neb nec nee nei nen ner nia nib nic nie nii nin nir nna nnb nnc nne nni nnn nra nrb nrc nre nri nrn nrr ra- raa rab rac rae rai ran rar rba rbb rbc rbe rbi rbn rbr rca rcb rcc rce rci rcn rcr re- rea reb rec ree rei ren rer ria rib ric rie rii rin rir rna rnb rnc rni rnn rnr rra rrb rrc rri rrn rrr