-ic a-a a-b a-c a-i aaa aab aac aad aae aaf aai aao aas ab- aba abb abc abd abe abf abi abo abs ac- aca acb acc acd ace acf aci aco acs ad- ada adb adc add ade adf adi ado ads aea aeb aec aed aee aef aei aeo aes af- afa afb afc afd afe aff afi afo afs ai- aia aib aic aid aie aif aii aio ais aoa aob aoc aod aoe aof aoi aoo aos as- asa asb asc asd ase asf asi aso ass baa bab bac bad bae baf bai bao bas bba bbb bbc bbd bbe bbf bbi bbo bbs bca bcb bcc bcd bce bcf bci bco bcs bda bdb bdc bdd bde bdf bdi bdo bds be- bea beb bec bed bee bef bei beo bes bfa bfb bfc bfd bfe bff bfi bfo bfs bi- bia bib bic bid bie bif bii bio bis boa bob boc bod boe bof boi boo bos bsa bsb bsc bsd bse bsf bsi bso bss c-- caa cab cac cad cae caf cai cao cas cba cbb cbc cbd cbe cbf cbi cbo cbs cca ccb ccc ccd cce ccf cci cco ccs cda cdb cdc cdd cde cdf cdi cdo cds ce- cea ceb cec ced cee cef cei ceo ces cfa cfb cfc cfd cfe cff cfi cfo cfs ci- cia cib cic cid cie cif cii cio cis co- coa cob coc cod coe cof coi coo cos csa csb csc csd cse csf csi cso css daa dab dac dad dae daf dai dao das dba dbb dbc dbd dbe dbf dbi dbo dbs dca dcb dcc dcd dce dcf dci dco dcs dda ddb ddc ddd dde ddf ddi ddo dds de- dea deb dec ded dee def dei deo des dfa dfb dfc dfd dfe dff dfi dfo dfs di- dia dib dic did die dif dii dio dis doa dob doc dod doe dof doi doo dos dsa dsb dsc dsd dse dsf dsi dso dss eaa eab eac ead eae eaf eai eao eas eba ebb ebc ebd ebe ebf ebi ebo ebs ec- eca ecb ecc ecd ece ecf eci eco ecs ed- eda edb edc edd ede edf edi edo eds eea eeb eec eed eee eef eeo ees ef- efa efb efc efd efe eff efi efo efs eia eib eic eid eie eif eii eio eis eo- eoa eob eoc eod eoe eof eoi eoo eos es- esa esb esc esd ese esf esi eso ess faa fab fac fad fae faf fai fao fas fba fbb fbc fbd fbe fbf fbi fbo fbs fca fcb fcc fcd fce fcf fci fco fcs fda fdb fdc fdd fde fdf fdi fdo fds fea feb fec fed fee fef fei feo fes ffa ffc ffd ffe fff ffi ffo ffs fia fib fic fid fie fif fii fis foa fob foc foe fof foi foo fos fsa fsb fsc fsd fse fsf fsi fso fss i-d i-f ia- iaa iab iac iad iae iaf iai iao ias iba ibb ibc ibd ibe ibf ibi ibo ibs ica icb icc icd ice icf ici ico ics ida idb idc idd ide idf idi ido ids ie- iea iec ied iee ief iei ies ifa ifb ifc ifd ife iff ifi ifo ifs iia iib iic iid iie iif iii iio iis io- ioa iob ioc iod ioe iof ioi ioo ios is- isa isb isc isd ise isf isi iso iss o-i oaa oab oac oad oae oaf oai oao oas ob- oba obb obc obd obe obf obi obo obs oc- oca ocb occ ocd ocf oci oco ocs oda odb odc odd ode odf odi odo ods oea oeb oec oed oee oef oei oeo oes of- ofa ofb ofc ofd ofe off ofi ofo ofs oia oib oic oid oie oif oii oio ois oo- ooa oob ooc ood oof ooi ooo oos os- osa osb osc osd ose osf osi oso oss saa sab sac sad sae saf sai sao sas sba sbb sbc sbd sbe sbf sbi sbo sbs sca scb scc scd sce scf sci sco scs sda sdb sdc sdd sde sdf sdi sdo sds se- sea seb sec sed see sef sei seo ses sfa sfb sfc sfd sfe sff sfi sfo sfs sia sib sic sid sie sif sii sio sis soa sob soc sod soe sof soi soo sos ss- ssa ssb ssc ssd sse ssf ssi sso sss