fff ffl ffn ffr ffs fft ffu flf fll fln flr fls flt flu fnf fnl fnn fnr fns fnt fnu frf frl frn frr frs frt fru fsf fsl fsn fsr fss fst fsu ftf ftl ftn ftr fts ftt ftu fuf ful fun fur fus fut fuu lff lfl lfn lfr lfs lft lfu llf lll lln llr lls llt llu lnl lnn lnr lns lnt lnu lrf lrn lrr lrs lrt lru lsf lsl lsn lsr lss lst lsu ltf ltl ltr lts ltt ltu luf lul lun lur lus lut luu nff nfl nfn nfr nfs nft nfu nlf nll nln nlr nls nlt nlu nnf nnl nnn nns nnt nnu nrf nrl nrn nrr nrs nrt nru nsf nsl nsn nsr nss nst nsu ntf ntn ntr nts ntt ntu nul nun nur nus nut nuu rff rfl rfn rfr rfs rft rfu rlf rll rln rlr rls rlt rlu rnn rnr rns rnt rnu rrf rrl rrn rrr rrs rrt rru rsf rsl rsn rsr rss rst rsu rtf rtl rtn rtr rts rtt rtu ruf run rur rus rut ruu sff sfl sfn sfr sfs sft sfu slf sll sln slr sls slt slu snf snl snn snr sns snt snu sr- srf srl srn srr srs srt ss- ssf ssl ssn ssr sss sst ssu stf stl stn str sts stt stu suf sul sun sur sus sut suu tff tfl tfn tfr tfs tft tfu tlf tll tln tlr tls tlt tlu tnf tnl tnn tnr tns tnt trf trl trn trr trs trt tru tsf tsl tsn tsr tss tst tsu ttf ttl ttn ttr tts ttt ttu tuf tul tun tur tus tut tuu uff ufl ufn ufr ufs uft ufu ulf ull uln ulr uls ult ulu un- unf unl unn unr uns unt unu ur- urf url urn urr urs urt uru usf usl usn usr uss ust usu utf utl utn utr uts utt utu uun uur uus uut uuu