-ic a-a a-b a-c a-i aaa aab aac aag aai aao aas ab- aba abb abc abg abi abo abs ac- aca acb acc acg aci aco acs ag- aga agb agc agg agi ago ags ai- aia aib aic aig aii aio ais aoa aob aoc aog aoi aoo aos as- asa asb asc asg asi aso ass baa bab bac bag bai bao bas bba bbb bbc bbg bbi bbo bbs bca bcb bcc bcg bci bco bcs bga bgb bgc bgg bgi bgo bgs bi- bia bib bic big bii bio bis boa bob boc bog boi boo bos bsa bsb bsc bsg bsi bso bss c-- caa cab cac cag cai cao cas cba cbb cbc cbg cbi cbo cbs cca ccb ccc ccg cci cco ccs cga cgb cgc cgg cgi cgo cgs ci- cia cib cic cig cii cio cis co- coa cob coc cog coi coo cos csa csb csc csg csi cso css gaa gab gac gag gai gao gas gba gbc gbg gbi gbo gbs gca gcb gcc gcg gci gco gcs gga ggb ggc ggg ggi ggo ggs gia gib gic gig gii gio gis goa gob goc gog goi goo gos gsa gsb gsc gsg gsi gso gss ia- iaa iab iac iag iai iao ias iba ibb ibc ibg ibi ibo ibs ica icb icc icg ici ico ics iga igb igc igg igi igo igs iia iib iic iii iio iis io- ioa iob ioc iog ioi ioo ios is- isa isb isc isg isi iso iss o-i oaa oab oac oag oai oao oas ob- oba obb obc obg obi obo obs oc- oca ocb occ ocg oci oco ocs oga ogc ogg ogi ogo ogs oia oib oic oii oio ois oo- ooa oob ooc oog ooi ooo oos os- osa osb osc osg osi oso oss saa sab sac sag sai sao sas sba sbb sbc sbg sbi sbo sbs sca scb scc scg sci sco scs sga sgb sgc sgg sgi sgo sgs sia sib sic sig sii sio sis soa sob soc sog soi soo sos ss- ssa ssb ssc ssg ssi sso sss