-er -ic a-a a-b a-c a-i aaa aab aac aae aai aak aan aar ab- aba abb abc abe abi abk abn abr ac- aca acb acc ace aci ack acn acr aea aeb aec aee aei aek aen aer ai- aia aib aic aie aii aik ain air aka akb akc ake aki akk akn akr an- ana anb anc ane ani ank ann anr ar- ara arb arc are ari ark arn arr baa bab bac bae bai bak ban bar bba bbb bbc bbe bbi bbk bbn bbr bca bcb bcc bce bci bck bcn bcr be- bea beb bec bee bei bek ben ber bi- bia bib bic bie bii bik bin bir bka bkb bkc bke bkk bkn bkr bna bnb bnc bne bni bnk bnn bnr bra brb bre bri brk brn brr c-- caa cab cac cae cai cak can car cba cbb cbc cbe cbi cbk cbn cbr cca ccb ccc cce cci cck ccn ccr ce- cea ceb cec cee cei cek cen cer ci- cia cib cic cie cii cik cin cir cka ckb ckc cki cn- cna cnb cnc cne cni cnn cnr cra crb crc cre cri crk crn crr eaa eab eac eae eai eak ean ear eba ebb ebc ebe ebi ebk ebn ebr ec- eca ecb ecc ece eci eck ecn ecr eea eeb eec eee eek een eer eia eib eic eie eii eik ein eir eka ekb ekc eke eki ekr en- ena enb enc ene eni enk enn enr era erb erc ere eri erk ern err ia- iaa iab iac iae iai ian iar iba ibb ibc ibe ibi ibk ibn ibr ica icb icc ice ici ick icn icr ie- iea iec iee iei iek ien ier iia iib iic iie iii iin iir ika ikb ikc ike iki ikk ikr in- ina inb inc ine ini ink inn inr ir- ira irb irc ire iri irk irn irr ka- kaa kab kac kae kai kak kan kar kba kbb kbc kbe kbi kbk kbn kbr kca kcb kcc kce kci kck kcn kcr ke- kea keb kec kee kei kek ken ker kia kib kic kie kii kik kin kir kkb kkc kke kki kkk kkn kkr kn- kna knc kne kni knk knn knr kra krc kri krk krn krr n-i naa nab nac nae nai nak nan nar nba nbb nbc nbe nbi nbk nbn nbr nca ncb ncc nce nci nck ncn ncr ne- nea neb nec nee nei nek nen ner nia nib nic nie nii nik nin nir nka nkc nke nki nkk nkn nkr nna nnb nnc nne nni nnk nnn nra nrb nrc nre nri nrk nrn nrr ra- raa rab rac rae rai rak ran rar rba rbb rbc rbe rbi rbk rbn rbr rca rcb rcc rce rci rcn rcr re- rea reb rec ree rei rek ren rer ria rib ric rie rii rik rin rir rkb rkc rke rkk rna rnb rnc rni rnn rnr rra rrb rrc rri rrk rrn rrr