-ic a-a a-b a-c a-i aaa aab aac aag aai aan aas ab- aba abb abc abg abi abn abs ac- aca acb acc acg aci acn acs ag- aga agb agc agg agi agn ags ai- aia aib aic aig aii ain ais an- ana anb anc ang ani ann ans as- asa asb asc asg asi asn ass baa bab bac bag bai ban bas bba bbb bbc bbg bbi bbn bbs bca bcb bcc bcg bci bcn bcs bga bgb bgc bgg bgi bgn bgs bi- bia bib bic big bii bin bis bna bnb bnc bng bni bnn bns bsa bsb bsc bsg bsi bsn bss c-- caa cab cac cag cai can cas cba cbb cbc cbg cbi cbn cbs cca ccb ccc ccg cci ccn ccs cga cgb cgc cgg cgi cgn cgs ci- cia cib cic cig cii cin cis cn- cna cnb cnc cng cni cnn cns csa csb csc csg csi csn css gaa gab gac gag gai gan gas gba gbc gbg gbi gbn gbs gca gcb gcc gcg gci gcn gcs gga ggb ggc ggg ggi ggn ggs gia gib gic gig gii gin gis gna gnb gnc gni gnn gns gsa gsb gsc gsg gsi gsn gss ia- iaa iab iac iag iai ian ias iba ibb ibc ibg ibi ibn ibs ica icb icc icg ici icn ics iga igb igc igg igi ign igs iia iib iic iii iin iis in- ina inb inc ing ini inn ins is- isa isb isc isg isi isn iss n-i naa nab nac nag nai nan nas nba nbb nbc nbg nbi nbn nbs nca ncb ncc ncg nci ncn ncs nga ngb ngc ngg ngi ngn ngs nia nib nic nig nii nin nis nna nnb nnc nng nni nnn nns nsa nsb nsc nsg nsi nsn nss saa sab sac sag sai san sas sba sbb sbc sbg sbi sbn sbs sca scb scc scg sci scn scs sga sgb sgc sgg sgi sgn sgs sia sib sic sig sii sin sis sna snb snc sng sni snn sns ss- ssa ssb ssc ssg ssi ssn sss