-ol fff ffl ffo ffr ffs fft ffu ffx flf fll flo flr fls flt flu flx fof fol foo for fos fot fou fox frf frl fro frr frs frt fru fsf fsl fso fsr fss fst fsu fsx ftf ftl fto ftr fts ftt ftu ftx fuf ful fuo fur fus fut fuu fux fxr fxs fxt fxu fxx lff lfl lfo lfr lfs lft lfu lfx llf lll llo llr lls llt llu lof lol loo lor los lot lou lox lrf lro lrr lrs lrt lru lsf lsl lso lsr lss lst lsu ltf ltl lto ltr lts ltt ltu ltx luf lul luo lur lus lut luu lux lxo lxr lxx of- off ofl ofo ofr ofs oft ofu ofx olf oll olo ols olt olu oo- oof ool ooo oor oos oot oox or- orf orl oro orr ors ort oru orx os- osf osl oso osr oss ost osu osx ot- otf otl oto otr ots ott otu ou- ouf oul ouo our ous out ox- oxf oxo oxt oxx rff rfl rfo rfr rfs rft rfu rlf rll rlo rlr rls rlt rlu rof rol roo ror ros rot rou rox rrf rrl rrr rrs rrt rru rsf rsl rso rsr rss rst rsu rsx rtf rtl rto rtr rts rtt rtu rtx ruf ruo rur rus rut ruu rux rxr rxs sff sfl sfo sfr sfs sft sfu sfx slf sll slo slr sls slt slu slx sof sol soo sor sos sot sou sox sr- srf srl sro srr srs srt srx ss- ssf ssl sso ssr sss sst ssu ssx stf stl sto str sts stt stu stx suf sul suo sur sus sut suu sux sxl sxs sxt sxu t-x tff tfl tfo tfr tfs tft tfu tfx tlf tll tlo tlr tls tlt tlu tlx to- tof tol too tor tos tot tou tox trf trl tro trr trs trt tru trx tsf tsl tso tsr tss tst tsu tsx ttf ttl tto ttr tts ttt ttu ttx tuf tul tuo tur tus tut tuu tux txf txl txs txt txu uff ufl ufo ufr ufs uft ufu ufx ulf ull ulo ulr uls ult ulu uol uoo uor uos uot uox ur- urf url uro urr urs urt uru urx usf usl uso usr uss ust usu usx utf utl uto utr uts utt utu utx uur uus uut uuu uxf uxo uxr uxt uxu xfl xfs xft xfx xlf xlr xls xlt xof xoo xor xos xot xox xrf xrt xrx xsl xss xst xtf xtr xts xtx xul xus xxl xxo xxx