-ic a-a a-b a-c a-i aaa aab aac aag aai aan aar aas ab- aba abb abc abg abi abn abr abs ac- aca acb acc acg aci acn acr acs ag- aga agb agc agg agi agn agr ags ai- aia aib aic aig aii ain air ais an- ana anb anc ang ani ann anr ans ar- ara arb arc arg ari arn arr ars as- asa asb asc asg asi asn asr ass baa bab bac bag bai ban bar bas bba bbb bbc bbg bbi bbn bbr bbs bca bcb bcc bcg bci bcn bcr bcs bga bgb bgc bgg bgi bgn bgr bgs bi- bia bib bic big bii bin bir bis bna bnb bnc bng bni bnn bnr bns bra brb brg bri brn brr brs bsa bsb bsc bsg bsi bsn bsr bss c-- caa cab cac cag cai can car cas cba cbb cbc cbg cbi cbn cbr cbs cca ccb ccc ccg cci ccn ccr ccs cga cgb cgc cgg cgi cgn cgr cgs ci- cia cib cic cig cii cin cir cis cn- cna cnb cnc cng cni cnn cnr cns cra crb crc crg cri crn crr crs csa csb csc csg csi csn csr css gaa gab gac gag gai gan gar gas gba gbc gbg gbi gbn gbr gbs gca gcb gcc gcg gci gcn gcr gcs gga ggb ggc ggg ggi ggn ggr ggs gia gib gic gig gii gin gir gis gna gnb gnc gni gnn gnr gns gra grb grc grg gri grn grr grs gsa gsb gsc gsg gsi gsn gsr gss ia- iaa iab iac iag iai ian iar ias iba ibb ibc ibg ibi ibn ibr ibs ica icb icc icg ici icn icr ics iga igb igc igg igi ign igr igs iia iib iic iii iin iir iis in- ina inb inc ing ini inn inr ins ir- ira irb irc irg iri irn irr irs is- isa isb isc isg isi isn isr iss n-i naa nab nac nag nai nan nar nas nba nbb nbc nbg nbi nbn nbr nbs nca ncb ncc ncg nci ncn ncr ncs nga ngb ngc ngg ngi ngn ngs nia nib nic nig nii nin nir nis nna nnb nnc nng nni nnn nns nra nrb nrc nrg nri nrn nrr nrs nsa nsb nsc nsg nsi nsn nsr nss ra- raa rab rac rag rai ran rar ras rba rbb rbc rbg rbi rbn rbr rbs rca rcb rcc rcg rci rcn rcr rcs rga rgb rgc rgg rgi rgn rgr rgs ria rib ric rig rii rin rir ris rna rnb rnc rng rni rnn rnr rns rra rrb rrc rrg rri rrn rrr rrs rsa rsb rsc rsg rsi rsn rsr rss saa sab sac sag sai san sar sas sba sbb sbc sbg sbi sbn sbr sbs sca scb scc scg sci scn scr scs sga sgb sgc sgg sgi sgn sgr sgs sia sib sic sig sii sin sir sis sna snb snc sng sni snn snr sns sr- sra srb src srg sri srn srr srs ss- ssa ssb ssc ssg ssi ssn ssr sss