a-a a-t aaa aaf aam aao aas aat aax af- afa aff afm afo afs aft afx ama amf amm amo ams amt amx aoa aof aom aoo aos aot aox as- asa asf asm aso ass ast asx at- ata atf atm ato ats att atx ax- axa axm axo axs axt axx faa faf fam fao fas fat fax ffa fff ffm ffo ffs fft ffx fma fmf fmm fmo fms fmt fmx foa fof fom foo fos fot fox fsa fsf fsm fso fss fst fsx fta ftf ftm fto fts ftt ftx fxm fxs fxt fxx m-f m-o maa maf mam mao mas mat max mfa mff mfm mfo mfs mft mma mmf mmm mmo mms mmt mmx moa mof mom moo mos mot mox msa msf msm mso mss mst msx mta mtf mtm mto mts mtt mtx mxa mxs oaa oaf oam oao oas oat oax of- ofa off ofm ofo ofs oft ofx om- oma omf omm omo oms omt omx oo- ooa oof oom ooo oos oot oox os- osa osf osm oso oss ost osx ot- ota otf otm oto ots ott ox- oxa oxf oxo oxt oxx saa saf sam sao sas sat sax sfa sff sfm sfo sfs sft sfx sma smf smm smo sms smt smx soa sof som soo sos sot sox ss- ssa ssf ssm sso sss sst ssx sta stf stm sto sts stt stx sxm sxs sxt t-x taa taf tam tao tas tat tax tfa tff tfm tfo tfs tft tfx tma tmf tmm tmo tms tmt tmx to- toa tof tom too tos tot tox tsa tsf tsm tso tss tst tsx tta ttf ttm tto tts ttt ttx txf txs txt xaa xaf xam xas xat xfa xfm xfs xft xfx xma xmf xmm xmo xms xmt xmx xoa xof xom xoo xos xot xox xsa xsm xss xst xtf xtm xts xtx xxo xxx