fff ffi ffl ffr ffs fft ffu fif fii fil fir fis fit fiu flf fli fll flr fls flt flu frf fri frl frr frs frt fru fsf fsi fsl fsr fss fst fsu ftf fti ftl ftr fts ftt ftu fuf fui ful fur fus fut fuu i-f iff ifi ifl ifr ifs ift ifu iif iii iil iir iis iit iiu il- ilf ili ill ilr ils ilt ilu ir- irf iri irl irr irs irt iru is- isf isi isl isr iss ist isu itf iti itl its itt itu iu- iui iur ius iut lff lfi lfl lfr lfs lft lfu lif lii lil lir lis lit liu llf lli lll llr lls llt llu lrf lri lrr lrs lrt lru lsf lsi lsl lsr lss lst lsu ltf lti ltl ltr lts ltt ltu luf lui lul lur lus lut luu rff rfi rfl rfr rfs rft rfu rif rii ril rir ris rit rlf rli rll rlr rls rlt rlu rrf rri rrl rrr rrs rrt rru rsf rsi rsl rsr rss rst rsu rtf rti rtl rtr rts rtt rtu ruf rui rur rus rut ruu sff sfi sfl sfr sfs sft sfu sif sii sil sir sis sit siu slf sli sll slr sls slt slu sr- srf sri srl srr srs srt ss- ssf ssi ssl ssr sss sst ssu stf sti stl str sts stt stu suf sui sul sur sus sut suu tff tfi tfl tfr tfs tft tfu tif tii til tir tis tit tiu tlf tli tll tlr tls tlt tlu trf tri trl trr trs trt tru tsf tsi tsl tsr tss tst tsu ttf tti ttl ttr tts ttt ttu tuf tui tul tur tus tut tuu uff ufi ufl ufr ufs uft ufu uif uii uil uir uis uit uiu ulf uli ull ulr uls ult ulu ur- urf uri url urr urs urt uru usf usi usl usr uss ust usu utf uti utl utr uts utt utu uur uus uut uuu