-ic a-a a-b a-c a-i aaa aab aac aag aai aao aar aax ab- aba abb abc abg abi abo abr abx ac- aca acb acc acg aci aco acr acx ag- aga agb agc agg agi ago agr agx ai- aia aib aic aig aii aio air aix aoa aob aoc aog aoi aoo aor aox ar- ara arb arc arg ari aro arr arx ax- axa axi axo axr axx baa bab bac bag bai bao bar bax bba bbb bbc bbg bbi bbo bbr bbx bca bcb bcc bcg bci bco bcr bcx bga bgb bgc bgg bgi bgo bgr bgx bi- bia bib bic big bii bio bir bix boa bob boc bog boi boo bor box bra brb brg bri bro brr brx bxb bxi bxo bxx c-- caa cab cac cag cai cao car cax cba cbb cbc cbg cbi cbo cbr cbx cca ccb ccc ccg cci cco ccr ccx cga cgb cgc cgg cgi cgo cgr ci- cia cib cic cig cii cio cir cix co- coa cob coc cog coi coo cor cox cra crb crc crg cri cro crr crx cxc cxi cxo cxr cxx gaa gab gac gag gai gao gar gba gbc gbg gbi gbo gbr gbx gca gcb gcc gcg gci gco gcr gga ggb ggc ggg ggi ggo ggr gia gib gic gig gii gio gir goa gob goc gog goi goo gor gox gra grb grc grg gri gro grr grx gxa ia- iaa iab iac iag iai iao iar iba ibb ibc ibg ibi ibo ibr ibx ica icb icc icg ici ico icr iga igb igc igg igi igo igr iia iib iic iii iio iir iix io- ioa iob ioc iog ioi ioo ior ir- ira irb irc irg iri iro irr irx ixc ixi o-i oaa oab oac oag oai oao oar oax ob- oba obb obc obg obi obo obr obx oc- oca ocb occ ocg oci oco ocr ocx oga ogc ogg ogi ogo ogx oia oib oic oii oio oir oo- ooa oob ooc oog ooi ooo oor oox or- ora orb orc org ori oro orr orx ox- oxa oxb oxc oxi oxo oxx ra- raa rab rac rag rai rao rar rax rba rbb rbc rbg rbi rbo rbr rbx rca rcb rcc rcg rci rco rcr rcx rga rgb rgc rgg rgi rgo rgr rgx ria rib ric rig rii rio rir rix roa rob roc rog roi roo ror rox rra rrb rrc rrg rri rrr rxr xaa xac xag xar xbc xbr xbx xcb xci xcr xcx xgi xia xic xii xio xix xoa xoc xog xoi xoo xor xox xrc xrx xxi xxo xxx