-ic a-a a-b a-c a-i aaa aab aac aae aai aak aan aas ab- aba abb abc abe abi abk abn abs ac- aca acb acc ace aci ack acn acs aea aeb aec aee aei aek aen aes ai- aia aib aic aie aii aik ain ais aka akb akc ake aki akk akn aks an- ana anb anc ane ani ank ann ans as- asa asb asc ase asi ask asn ass baa bab bac bae bai bak ban bas bba bbb bbc bbe bbi bbk bbn bbs bca bcb bcc bce bci bck bcn bcs be- bea beb bec bee bei bek ben bes bi- bia bib bic bie bii bik bin bis bka bkb bkc bke bkk bkn bks bna bnb bnc bne bni bnk bnn bns bsa bsb bsc bse bsi bsk bsn bss c-- caa cab cac cae cai cak can cas cba cbb cbc cbe cbi cbk cbn cbs cca ccb ccc cce cci cck ccn ccs ce- cea ceb cec cee cei cek cen ces ci- cia cib cic cie cii cik cin cis cka ckb ckc cki cks cn- cna cnb cnc cne cni cnn cns csa csb csc cse csi csk csn css eaa eab eac eae eai eak ean eas eba ebb ebc ebe ebi ebk ebn ebs ec- eca ecb ecc ece eci eck ecn ecs eea eeb eec eee eek een ees eia eib eic eie eii eik ein eis eka ekb ekc eke eki eks en- ena enb enc ene eni enk enn ens es- esa esb esc ese esi esk esn ess ia- iaa iab iac iae iai ian ias iba ibb ibc ibe ibi ibk ibn ibs ica icb icc ice ici ick icn ics ie- iea iec iee iei iek ien ies iia iib iic iie iii iin iis ika ikb ikc ike iki ikk iks in- ina inb inc ine ini ink inn ins is- isa isb isc ise isi isk isn iss ka- kaa kab kac kae kai kak kan kas kba kbb kbc kbe kbi kbk kbn kbs kca kcb kcc kce kci kck kcn kcs ke- kea keb kec kee kei kek ken kes kia kib kic kie kii kik kin kis kkb kkc kke kki kkk kkn kks kn- kna knc kne kni knk knn ksa ksb ksc kse ksi ksk ksn kss n-i naa nab nac nae nai nak nan nas nba nbb nbc nbe nbi nbk nbn nbs nca ncb ncc nce nci nck ncn ncs ne- nea neb nec nee nei nek nen nes nia nib nic nie nii nik nin nis nka nkc nke nki nkk nkn nks nna nnb nnc nne nni nnk nnn nns nsa nsb nsc nse nsi nsk nsn nss saa sab sac sae sai sak san sas sba sbb sbc sbe sbi sbk sbn sbs sca scb scc sce sci sck scn scs se- sea seb sec see sei sek sen ses sia sib sic sie sii sik sin sis sk- ska skb skc ske ski skk sks sna snb snc sne sni snk snn sns ss- ssa ssb ssc sse ssi ssk ssn sss