-ic a-a a-b a-c a-i aaa aab aac aai aan aar aas ab- aba abb abc abi abn abr abs ac- aca acb acc aci acn acr acs ai- aia aib aic aii ain air ais an- ana anb anc ani ann anr ans ar- ara arb arc ari arn arr ars as- asa asb asc asi asn asr ass baa bab bac bai ban bar bas bba bbb bbc bbi bbn bbr bbs bca bcb bcc bci bcn bcr bcs bi- bia bib bic bii bin bir bis bna bnb bnc bni bnn bnr bns bra brb bri brn brr brs bsa bsb bsc bsi bsn bsr bss c-- caa cab cac cai can car cas cba cbb cbc cbi cbn cbr cbs cca ccb ccc cci ccn ccr ccs ci- cia cib cic cii cin cir cis cn- cna cnb cnc cni cnn cnr cns cra crb crc cri crn crr crs csa csb csc csi csn csr css ia- iaa iab iac iai ian iar ias iba ibb ibc ibi ibn ibr ibs ica icb icc ici icn icr ics iia iib iic iii iin iir iis in- ina inb inc ini inn inr ins ir- ira irb irc iri irn irr irs is- isa isb isc isi isn isr iss n-i naa nab nac nai nan nar nas nba nbb nbc nbi nbn nbr nbs nca ncb ncc nci ncn ncr ncs nia nib nic nii nin nir nis nna nnb nnc nni nnn nns nra nrb nrc nri nrn nrr nrs nsa nsb nsc nsi nsn nsr nss ra- raa rab rac rai ran rar ras rba rbb rbc rbi rbn rbr rbs rca rcb rcc rci rcn rcr rcs ria rib ric rii rin rir ris rna rnb rnc rni rnn rnr rns rra rrb rrc rri rrn rrr rrs rsa rsb rsc rsi rsn rsr rss saa sab sac sai san sar sas sba sbb sbc sbi sbn sbr sbs sca scb scc sci scn scr scs sia sib sic sii sin sir sis sna snb snc sni snn snr sns sr- sra srb src sri srn srr srs ss- ssa ssb ssc ssi ssn ssr sss