-ic a-a a-b a-c a-i aaa aab aac aae aag aai aan aas ab- aba abb abc abe abg abi abn abs ac- aca acb acc ace acg aci acn acs aea aeb aec aee aeg aei aen aes ag- aga agb agc age agg agi agn ags ai- aia aib aic aie aig aii ain ais an- ana anb anc ane ang ani ann ans as- asa asb asc ase asg asi asn ass baa bab bac bae bag bai ban bas bba bbb bbc bbe bbg bbi bbn bbs bca bcb bcc bce bcg bci bcn bcs be- bea beb bec bee beg bei ben bes bga bgb bgc bge bgg bgi bgn bgs bi- bia bib bic bie big bii bin bis bna bnb bnc bne bng bni bnn bns bsa bsb bsc bse bsg bsi bsn bss c-- caa cab cac cae cag cai can cas cba cbb cbc cbe cbg cbi cbn cbs cca ccb ccc cce ccg cci ccn ccs ce- cea ceb cec cee ceg cei cen ces cga cgb cgc cge cgg cgi cgn cgs ci- cia cib cic cie cig cii cin cis cn- cna cnb cnc cne cng cni cnn cns csa csb csc cse csg csi csn css eaa eab eac eae eag eai ean eas eba ebb ebc ebe ebg ebi ebn ebs ec- eca ecb ecc ece ecg eci ecn ecs eea eeb eec eee eeg een ees ega egb egc ege egg egi egn egs eia eib eic eie eig eii ein eis en- ena enb enc ene eng eni enn ens es- esa esb esc ese esg esi esn ess gaa gab gac gae gag gai gan gas gba gbc gbe gbg gbi gbn gbs gca gcb gcc gce gcg gci gcn gcs ge- gea geb gec gee geg gei gen ges gga ggb ggc ggg ggi ggn ggs gia gib gic gie gig gii gin gis gna gnb gnc gne gni gnn gns gsa gsb gsc gse gsg gsi gsn gss ia- iaa iab iac iae iag iai ian ias iba ibb ibc ibe ibg ibi ibn ibs ica icb icc ice icg ici icn ics ie- iea iec iee ieg iei ien ies iga igb igc ige igg igi ign igs iia iib iic iie iii iin iis in- ina inb inc ine ing ini inn ins is- isa isb isc ise isg isi isn iss n-i naa nab nac nae nag nai nan nas nba nbb nbc nbe nbg nbi nbn nbs nca ncb ncc nce ncg nci ncn ncs ne- nea neb nec nee neg nei nen nes nga ngb ngc nge ngg ngi ngn ngs nia nib nic nie nig nii nin nis nna nnb nnc nne nng nni nnn nns nsa nsb nsc nse nsg nsi nsn nss saa sab sac sae sag sai san sas sba sbb sbc sbe sbg sbi sbn sbs sca scb scc sce scg sci scn scs se- sea seb sec see seg sei sen ses sga sgb sgc sge sgg sgi sgn sgs sia sib sic sie sig sii sin sis sna snb snc sne sng sni snn sns ss- ssa ssb ssc sse ssg ssi ssn sss