-ic a-a a-b a-c a-i aaa aab aac aad aae aai aao aas aax ab- aba abb abc abd abe abi abo abs abx ac- aca acb acc acd ace aci aco acs acx ad- ada adb adc add ade adi ado ads adx aea aeb aec aed aee aei aeo aes aex ai- aia aib aic aid aie aii aio ais aix aoa aob aoc aod aoe aoi aoo aos aox as- asa asb asc asd ase asi aso ass asx ax- axa axe axi axo axs axx baa bab bac bad bae bai bao bas bax bba bbb bbc bbd bbe bbi bbo bbs bbx bca bcb bcc bcd bce bci bco bcs bcx bda bdb bdc bdd bde bdi bdo bds bdx be- bea beb bec bed bee bei beo bes bex bi- bia bib bic bid bie bii bio bis bix boa bob boc bod boe boi boo bos box bsa bsb bsc bsd bse bsi bso bss bsx bxb bxd bxi bxo bxx c-- caa cab cac cad cae cai cao cas cax cba cbb cbc cbd cbe cbi cbo cbs cbx cca ccb ccc ccd cce cci cco ccs ccx cda cdb cdc cdd cde cdi cdo cds cdx ce- cea ceb cec ced cee cei ceo ces cex ci- cia cib cic cid cie cii cio cis cix co- coa cob coc cod coe coi coo cos cox csa csb csc csd cse csi cso css csx cxc cxi cxo cxs cxx daa dab dac dad dae dai dao das dax dba dbb dbc dbd dbe dbi dbo dbs dbx dca dcb dcc dcd dce dci dco dcs dcx dda ddb ddc ddd dde ddi ddo dds ddx de- dea deb dec ded dee dei deo des dex di- dia dib dic did die dii dio dis dix doa dob doc dod doe doi doo dos dox dsa dsb dsc dsd dse dsi dso dss dsx dxc dxd dxi dxo dxs dxx eaa eab eac ead eae eai eao eas eax eba ebb ebc ebd ebe ebi ebo ebs ebx ec- eca ecb ecc ecd ece eci eco ecs ecx ed- eda edb edc edd ede edi edo eds edx eea eeb eec eed eee eeo ees eex eia eib eic eid eie eii eio eis eix eo- eoa eob eoc eod eoe eoi eoo eos es- esa esb esc esd ese esi eso ess esx ex- exa exc exd exe exi exo exs exx i-d ia- iaa iab iac iad iae iai iao ias iba ibb ibc ibd ibe ibi ibo ibs ibx ica icb icc icd ice ici ico ics ida idb idc idd ide idi ido ids idx ie- iea iec ied iee iei ies iex iia iib iic iid iie iii iio iis iix io- ioa iob ioc iod ioe ioi ioo ios is- isa isb isc isd ise isi iso iss ixc ixe ixi o-i oaa oab oac oad oae oai oao oas oax ob- oba obb obc obd obe obi obo obs obx oc- oca ocb occ ocd oci oco ocs ocx oda odb odc odd ode odi odo ods oea oeb oec oed oee oei oeo oes oex oia oib oic oid oie oii oio ois oo- ooa oob ooc ood ooi ooo oos oox os- osa osb osc osd ose osi oso oss osx ox- oxa oxb oxc oxi oxo oxx saa sab sac sad sae sai sao sas sax sba sbb sbc sbd sbe sbi sbo sbs sbx sca scb scc scd sce sci sco scs scx sda sdb sdc sdd sde sdi sdo sds se- sea seb sec sed see sei seo ses sex sia sib sic sid sie sii sio sis six soa sob soc sod soe soi soo sos sox ss- ssa ssb ssc ssd sse ssi sso sss ssx sxc sxi sxs xaa xac xad xas xbc xbe xbx xcb xcd xci xcx xda xdb xdc xde xdi xds xed xee xes xex xia xic xie xii xio xis xix xoa xoc xod xoi xoo xos xox xsa xsb xsc xsi xss xxi xxo xxx