%PDF-1.3 % ReportLab Generated PDF document http://www.reportlab.com 1 0 obj << /F1 2 0 R /F2+0 7 0 R >> endobj 2 0 obj << /BaseFont /Helvetica /Encoding /WinAnsiEncoding /Name /F1 /Subtype /Type1 /Type /Font >> endobj 3 0 obj << /Contents 13 0 R /MediaBox [ 0 0 595.2756 841.8898 ] /Parent 12 0 R /Resources << /Font 1 0 R /ProcSet [ /PDF /Text /ImageB /ImageC /ImageI ] >> /Rotate 0 /Trans << >> /Type /Page >> endobj 4 0 obj << /Filter [ /FlateDecode ] /Length 900 >> stream xmۊFw`έ7A?B]6.4-?m6>r==5󿧝oG2__v[l8O۷{ݾhbǗi?籙4_?ncS{Gznx_^S.ri_g-|{9NŔ){n r@)۶vE.ِW3[Sf\/9Oy9X5 hE^OYNv-lWÜ]8WX 2 2u ?zuumq.rn@Yk1<>p*~aL dm;XC _0O, 3(3UsgFmK0>2g.QbQaF ˖UfG~_~_~_~_~_H~_Z~_W~_W~_W~_W~_W~_W~_W~7~7~{7|~7~7~7~w~w~w-N;N+w~w~w?@П$??3AA͞C?5d?{ɱ3Y-^Q={u CxjO[\mwǬQµT-M|6+.c>fn[ԭg`%/SBKe+犈5+~OtK2p0 Նendstream endobj 5 0 obj << /Filter [ /FlateDecode ] /Length 23795 /Length1 35972 >> stream xyՕ/xo܈[[efY{*%!ٗj0* YlC 2P۬v6AhGxQwP¢Yуگ_W972T377̤*3ʈ{0BHGw"֝[Z߮59 "G-7iy!xp|-E[>[>c;kǮ`nCM'l|ʼnop.elD47\/gοiz784|pt!؞;6$!~g9|d%Z(utQԁ؛Gx^א葇+" HA*#pu9EQBJJ ʢʣ*\*:QF=~TCh a4FEh-FKZIhZNC Ag,t6:CSC\t:].D%Rtjh]DW5Zt}݀>6i mF7h $݊nCOOϠ;@}}݅F[= K+^ *ݏЉ4ljc-B(+ĉ1@|$!6lϟ=g߸V=܉߃C-|_h)D+gCWmpÿ$\{m]V*.c/ ě4gp^`lX',XW*Ւ'R>ZuQi8V=ZqOhjgJF.<$3nrry.*$:ؼϹ}5o2G *فm[~x8 pehՇ:)̼kd}KQz G[> PB?ƆAJu4>u&eG]M V[ZbK.☁NJrqH %Y-c _vY&SC#MB <zlbkz$^D*遟1HMiȐ'ɥDr%b~ 0l6'Go4o]@±j 6 q~6 񉣣/NJZ_3Hا%S)pꎘjR j}FoҗuuVaӄ/*du8wD"hD>MŔ 92lz /r ,ekʦt^ODW5"_ yUK4dF˗oNW5,q>X}DfZ뱵[^ ²b ɐjև+qQ/Xr Un"SC*Is W@) ţ'$R%\]4j#)C2x$]1~>H0bcVۭ3 ٽq}Q8^p1 O?mۼY2B(Irӗ=i٣JIKg ]W;lK>|C2z Ꚙ+r%RB^stUG3%wݼaz0y1G bK?.sDk /iW8Km/.PQ+2_UFnOv*ׅ U.t˞cd?:/(]خ(!jLpE\e NRjGKXK.9Jŷ 4GERbKmsd@HXZgk !m2S2&U[+F2P+K0Q_D\o§Gw%%#jfV6-{gCnЈ MNy^mF;@лjI>sJxp 90L:)_Hq%K+{e5F$}5^T!+1?+ M yG[٦:Lб)&-:E e :ԐF7"%Ր(zꍠËJ*g[ϑ(oD .7S6lfZʓ^˦ Y@t*8' J- ~Vu ~H1րCơʇS)Y YB=1ip+iT ,dP^akK63¥>8ؙ&By^65 ,)\h+Ht#+Y}F'a5%YԈZLSkCYS^9A5Q,$k9!x bꗀˁۃ1 ڔ-oNɈ5:([bLu>uFiȒTMeM# a`'}uS%ܙ #])oѸ؟롪aY\vuG½**R*L'ʑkdzE Kx5\ڟXp?ny{IVTƾvv8:AIQ-E}O(;yDRt)׉aoV#FüA4?A]s9>GmX^"#Iġ%Ȝ.Ͼ ,>.sB\1 L,[ 7\aRrl\KSVErHKKC"-k4x)ƢV򎦇8#Q;|+bO P?X+m6-8DQw} s*`4c0q3{E1&91P[KK.n fmQ&_s$8b>*jq52:IjJ1!v9@)4 -3#6ѣ Y m%L1I%5`bXYEUKΊQQ3.QXL5ǬRU)m^7X<bJ}.WݫϗcX ΀@/\$4w-?~/WYV;yKHr'VbՕuZʣpc'Ea2z2OXMwpQIRR*J$ǜ]wPY@q//:]5φÖ2`0[c!=YMHPLv/=aQ27U.g<.U]H:$-b40888uq (O!푔sDl*K9!/Y%3K GhX 'h. .R⚞AΆ>x :8laZ a4v4*89[xs:J<xyRQ4*u ;4-=LEy८v]Y`5 wղi5D|MJ:"N_*hjYWǖo N6ّs20٘ךg@]gcl^JѺ!Rw;ulD<_-˯ĀhZ3W{4^ u0av#[ طyPCgZݿHŒOm,-HmӀEIqLȩFc2B̕R$9cƃE&%+@󔚚iP=].Qģi'L2೶>(R~2e*%lY\K'V"HhjhJ5YE)&*Z//Tp'&w,D+u/9Eo -A+yxng:c8+хV~XiO]={-nC*r#el9SR9pKtO)(TS#_MEUQ S: b-.sI5:Ն漄i/P 5r~L @nGkcTFb\Ugqk%vV}d" ,TW]x|HN=I8$\L%*'PK w@=_Z*ݘ0Š _⼯ C7~ev׸m9m ~v>Rj9NW3 Wjb*AzE[ U@ Bm ԵBy.cU>*`),k$2Q%P@ƒl6\W4-^$)@aj,KBt[M?ZZe Z蜶Z C4׈dSd .6k4Npe3:&ʆT }{oEטq+$5jH:2./ܿ~j#|j"|@)A hոҀCڪ.IIRф5/r"H_ń#TP=%r{vPyCR.#=E,335\+9z> cq]" &B1%AAAZ˪H=*kkm9gfK;4^NOW O:;=bTyT^NjAg]M]ƫ"cfoсh&z5#I;icƫ2{ב)!<56_9DoP+4:rrsR$ޜD[^(.arн8SҐ?*| = ;ґ׎rMNX* V8@09GedϷz2rQ%}KKٷd͔`É|Kؾ!J*O039@g諔Pt&>wq$1F"ikkdES´M.BJ3D8pvN[+ '~JTo4~bp~"IX.X{{KXNĜ>6I?kS#[3P@z=0'pOO{F~8>Ӊ_/&g^G;T !dA|CZӝJR QbWac#;k c]? wppzʩ8;o~{`s:Z Mh):Ї ?U,AX\7CC!̩m,\Gc;=?o4DǏ6g,s\cZ As Wi%YTp4#ڥj=j[Atǫ:ĵvz D ɏG3= <ڸBlK##GF3ƙHHi{n΍7M?[}~߮/zIvxCvvbA^#Pi"{hSyZSE<4;Raa?(`j=D;Go_C_m[_tQ"ɊV[Ί+V3t1<Ttf7mfalf!6&f'&cq;>aX<H3`ضKr2jjvB}Ύ݅N^1UUA awX^5d«.i *ϫJU .xA2R,%]3(xf%O+:TT|Y!/ˀi=%ST;t(ylXK:5"t Or "/ڍtKRj:b,>mM!4X$$$Nsug4‡ŧD 2"t?\ E M!| {SewRA~`:p@ekZ4i" !7|ҧqچO%4%M/HV<Aq LU:lٜZK.QI>\|1NOq9sS< =M[[Znn|TBںz&OhKy"ߍI' ZiռnDo=`%)y IǗ+ En,yO@='cb,*sfmlZ^N*9Yր|ӴlMusq2"%;B={LW2ugG EeMMfkvFjv/:[ހy腛razۄvyHF|yW?/Gޖ|MMRG{OӺ_DŨ`YЉCs(5gr+Z@Pf  oMx^~oAgGLכ-[[Row>{CURt?y~ɥ=pqy%yE.vm69rPY2 X 5RSGSS ɨ1c :ml vܜ6&^V $i[7˱%D]`X N mA֢Ljm";+uM/ƸY~Y-}C8G_92=)=9q*c8>(anU%љ1aS9B@cҰL!'ԄIR8!p#8 ԧ6QLiCRm&+M1dedUufꊢͩT6@r ԇIsbyRġ|M=!.=W,d:2s"/x/#M 󠲣661#޸q,Ǵ8r݂{!ʲد7j}=7]+L^Q듷{J-=>|\@ EU(nЫ]U\}/F}FC듳 SqkЁWƏ׎73oJMV&in5}I?bɿɐ/o??OA;N'M^qgXO|9dA.˄Iv.dd0~GgG|0jl"aZ|_1>K5͠l!APo Pe?{ߘeKlu%*:D0Ud(I"p^Ëa>·Ss[?? pց+OTW'{$FR8olLn ӗUԩ"C `e9B&JC[ -YL!(1%ofw"@)dmhsS%sCfU[XbJ5o>K(JGv=/x!z=á4iy _qL_.72Fzxɗr0 W8r /Ga3+*J~]({qBhnA"玥 T# 7M1n;^!$8 VNUB)K 8Y= Jq}!#ݡKּA 8վ?L}{)nnW}-h3;`wQ18?Xp" eΥsx&frHmmR_.0p0zU2T:0g_QiO)6_a Gl~4nӍr=?w;wJ{=ggKG=y;ܚWo͋q =h$$-a7 @ʰ^@ J %"(+(bdw&guMut.k;wkl$Tqft6sf64-8hPQӼQX#K|EAFdAXLҊ".U \vjc1f>wcY!fr"<+(OIs.Ph׽r)8NΕsL<`jgSP03P>JTcXCLAͅbSLhj蠢BKEW6tp Y󚶦 1r;~ mktݍ>nI~cm~Uǥ :n/<(yO\I:ѯO=b&٘LFjۢGyb4lpmvGjGٶ-}^BҾiQ66Ɓoߴ+ABWB=pG&K* Pp(faIOO/oZK}5/^~qo(xCߥ/__uWhM,IV"]" 淝( nsbL7r&9mM1-wxV5?mfw=;oM濛6fHY7fN0۔`C5LYf{nth 'XPE !/JtM8~YIjeitC;MY .lpocwL `? L_aJX9cϴYcZb:S¦ͭbȆs  V8Ofv̲z K?7jFͬYFUȗkUﱾX}zs9KշfiWB;rjVX5Rmٖ^T;Iq^(zd F] Pߋ( ۊ|45hC4 !~ld'b3x ^dwepP82eND.ξִnlgjJ֟9v `p5,0 zbdI ˟DW9,T-c(,%=r_GoggWm:0 r}p#;}O׳Go5MoKݖSDʬ"EȡVi``2鯇dA l,sfWoӶkLN^;n<.mA#1+|m%T ^8oI[%0sy VgoAҟχ?+¯.]V|uk׃qXx$R`I9xuV2vl}#2[B5m~ͧDdֻBu[:UU7]V^ C5YA;Pu(׺]4O)I$W ,M(e~BA1Ɖ 2ŢjL>JjWgeyY.u[<5 PK׫O,@-w+r4rXx@TC'){WI"(1 UveZ:F;$cX@U^a [lŘFYU%Dd&wFۀDFBto2lMD1,14g2l2ᓮ)0@t!7/W797Ev^BV,ŒwYd/ʜAŨry._.eXCU !~Fk:$7į&O$$)uxl%k?g:[*SkBM>cٹVT[1ӂZ#|A&R^"TݲkDؠY^i²mq%|盾꺒4A.z6X&5̷5\qƜ[1f#8ŅS f c'KC }hCm4ϥ~,GdHP%Q^/ l(dB)Trv9(7qwqq߷p/lηO0I( awM#M A!Y1 ϓz"V>32̙ ^fw!Pda²/3ٚj67̭~1p++?oc<ϕ je^w<2NsYLk͔.mkTS}O^ʟɭ)?Q݊|xz ݢ|2RޭHB^.V +bR:V9]9rxra*--Ki{(,;paqCqC7׏q`] # ‰=)*Jb4/bgu MDπCm@E§/ OP'u tUVO]1ş %ER(nѰPn $j?BQ>o=> e@VUC֔Z^ Djg+a6?џYE"SɉkGԌ3WQw#񃭵᧖xoOEdQn͸ 8%Z/FK*-$$Es0TOB`>V}Tk0sǰd bf>̿u}~x,arcY ua{;Ӆ3Y-~>ba vHþ==yGa06fA3]w]BKf6=== +%0 ±3Ƈ8ۥa^,°>8 nDvm KQ\"EUh/ $z& BfS*(:Y/6`hxlWǎN mKa#pꌫ@}`EŪkZ6$K0O;F,%3쫢ot~= ?Oǿʼn5KW+7$Ir(OoxФW)ƥ']F.8-Vv5= ,f(/袜˜NX\Abdȉ+S7 hto\lU͠/*tRzy+b> kM10̻= lR]u?OPI u8 -8x`k C8d>'JcDW(.*$j^6~4wcyCOSpIF &6' eSDN{HjeEV'&ɿex݄4XJsk(7"b06nUoMq~%>rǣh'еrtD0ų WbRɉx#0n%o7Y49Ϻ<~O>䧥ӨOZSb2d %阺9bS3tKOP0b0s jA߀mt}[wNnz: MSc'sP-х.SO{\[4@ 060^ЎihDAM獺:ڡCkLAPaU0NBKB9 fvw |1/'^"9Ɖߢ[>*:]l\tz{z_ZVX/ϞkkӥꞳLLϫҠ>T\x~hzvLfcDdhĄ1-8 tN>\>|( 0ײ_`OLDD^n#c][ѻ=ޚ{P^ @;og(ٜ]\`VdĪdv]d[- e\h2Zu葈>YP0{;9x?E;~x?{V! Sk*/쪦 TYr sx|U-UE[H~FOA' K4J)*ەʌB> < k:-hr{@r&j$MZ*oi(H~p?~=w $\8/lqQL_R!̒t5HMZ;8К);+?aSFWV@0yal@0/v &g-a6.;J? zv?ÿY?|7{~%2b5,G[rF( HV`ēR'y q<58h$֠հs `0U~5W@#>(A&z0\Q22&`3{c'щHci}xEtrv=Zdg}ƞ;zyɞ{/0 ݤW+c+o/ҩZ^r2vm%VW$+Hk57|VP3Ǧ('A6wWi  tA]!A ΋'ׁ=q6{UzV֪Tl˲i_Hx2o\:-_z,.fàblfe3HT!9=E4۞U; httǺ)EiiB1 ::d"%S)&vXT\zth: f}Y.`)?;ƈgq{ )a#ް$ܐ6iI̊Btz[cdRA Ҹ)efDj+TLiMՄ-вc*R(qEI$H1`*J:䗄==ɗoo++2L$.\EEP Ӡޣ-k+$mpe%#:k6su9bqJ[CuO>|޼ ×ll|X5;USKd5$|E# eIʤSYIbf.tEC+ul~G0+6!ϗV1 ˖mY.+NW'j_9?%auU dgzD]orܧ&猵\FLV 63G1MER2OV]_]4RKުig_ψj<&3U4me\ =(x ZSZKGB'?N mGb٨yp0 qG:nNj:[S6>h'ZŞ s5ݤ2eI=] H<0%^dYxA`\ߌzQ-~J+t2m[ʦ-Ç&T_!+i )/"ǜWI~+ WymbʯK=_A {<#Z[=OЊY㋋_P8]4\S,]Bf2!cWb()Ȍ ̑6c^o'vށߋǏ9tF?ǿ(b~yK|)˽zEI̸eأyLX1+g\G 9Ac@ 'Z=7f)<t'C{1.b U#cֱԶ*;Qޔih:EeR2Z۸1n]ԺܝvC}*y4u,B@iEici{14GET &K]9"ׅfҙ#@pe2sԴG*Xim#U,׬GkVXQav۩8"^_۞.1sw~Fs5~NrmfUpQwRvl>dt~~NS L{UVL4t22tĆLMmJU=;ԩDnT©(._E) A1l42pOEk ޱds3.% =AJns w>DıaZr͚+ /f<. 3CZ6S.ͽʽTn,іK%ɕ/꿳rlO?{My-s"KsR+v ݛupgMݯkngY;jC9;< n,qbrZfř~';OUO:/V\u>T󹪦UUڏ:+=]~[u_e ed2555ᦦ77HB}~'1u^ -SRK*U5BˣbP p;Ƹ\m hD7qIPzMѫh?>[={EFW}PSVWDjfu`ӮB 9*UhazZu򔃝S 3{ h^ l0Z/I~mՎp3 )}8T=5|=pOz/ls 5-PCk4)/܉G^=<Ԉ4˽gfwS>p%j<"=\MQe Ⰾo0QOw F߅3gWň2=%Z-˽iKETE(C:(mZN.gAQj:TS4HPG=#B}GY\}Q9cn0Hդ\#J݅)GQvH}B,cEu~H}PxnJ%ĄLN'b`[MpI3'< Լ]x28}֒rQZDӸZjWϤMXOk;J)qT2p}CĸS 4!4"1casbYi#ĈHJ,p$-b {8߈fg\o\jjr55X#ɤ|µw#AR(3B:h9C.8*o:,@BIfy {<:jkma<'Csj,7^٦4 za+f8ZBX@<3$ْ뚾uØ'+ɰڠJ5'=%L5T[X0`o0 >j>yvlKZPyҏ ڨ0¼g!vv{$y5Ѷl^B+|g۷OU lxjvADB@d i:M+t@2o$ߟ?J Y/٩E=-ZAԸ1 GfP$`S34;> &hnhB[QTMmLvZ!ilfq Ȕ'2eܶs!u [j m n[iꞫ6 ';i)M-!TYgWoG>J#}k@U8,<@J+3og*7.T}쐐E[p*|Q|AɨFPWa-Ez[/WʇG||Y[i-ex I5t$>Pdcv&JN=!59-[bTG,9 cG^+қWs&3>$6t]l4ef1HSFܜ'+@,n9cf\}P΍V>ewN#19םd@<-7px GZn!Ac߷i_LܦAK9Rɫ ΆpUf` Cga7ʓq*1~"kb5"#UIYt$ EcJSX MaZn[NܵVAf?_CFFVn@6S@>uϣW(Y%M)) ό2,%݁j Xz9 -FZ $I%߆[q)~\jԲ( n9̹ԶM]bGZCI|!a0)y2[Hpd//V9>勻=g=Uic1pXM[:tCJ ucpj \mܭ{|/I0J.d}I2E2"تiz6A`YmaG9Lk2.0C;Æb@a]a i% <$T^Eg!Ak!HH*^g.a:Xt4RJ˜6 A!UZ!۩*:;)ݶ 63L-)R.; o oOm:B%ՅT-0䩊n-@v7\_EЌA\c,np`h/0?B% lOz:iFcRUͼ#cX%xɏOdBLP=9݆7{a]IxQA62֔'* װS8޳$F ('Q>"&Y%iPD}j1{=+%a&7ed,*IȖY8YR6 ?޾D(Cڄje $=d0;rJͨp}5~^؆k4&[dpV紪54#'%jύ8P>}87X9תx=Y?af1޽;+ů äh^ݓR0IGX>g MK= QbW ,ηgR|}(~.׉k]6ۀ6dB!805v|͎h|s  w8^㼙3k z|z|y4gw{ $n˞787qиF\˛{x^0(7w|HM&]MM8@ hAnkx'>\ܮ/$Gn.umS{Mg~[eMsz^o?\ u^sod#)-ۿ h*x!qeB%OzSSSK1Iߑ9y+{GN[# 6pqc5<-}-m*OT*WUV\;h}y8>0v-KFF~|ު>9oѓc{cOO(Z#ok\\ '"[8@q2/_נņ>/@ cUrv=]pSq\>y꼸c87&*8΋ϾRW-(-yߵpm~A'Ė=Ѯ?v"1;x9Ks ]y@F,uٍ ҙ(:| OoP᡾ oz¥ǰr7ZVê"ʫ &lRI"HDWHbD"[Vuendstream endobj 6 0 obj << /Ascent 859.375 /CapHeight 859.375 /Descent -140.625 /Flags 4 /FontBBox [ 0 -140.625 996.0938 855.4688 ] /FontFile2 5 0 R /FontName /AAAAAA+SimSun-0 /ItalicAngle 0 /MissingWidth 1000 /StemV 87 /Type /FontDescriptor >> endobj 7 0 obj << /BaseFont /AAAAAA+SimSun-0 /FirstChar 0 /FontDescriptor 6 0 R /LastChar 149 /Name /F2+0 /Subtype /TrueType /ToUnicode 4 0 R /Type /Font /Widths [ 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 ] >> endobj 8 0 obj << /Outlines 10 0 R /PageMode /UseNone /Pages 12 0 R /Type /Catalog >> endobj 9 0 obj << /Author (anonymous) /CreationDate (D:20250117232420+08'00') /Creator (ReportLab PDF Library - www.reportlab.com) /Keywords () /ModDate (D:20250117232420+08'00') /Producer (ReportLab PDF Library - www.reportlab.com) /Subject (unspecified) /Title (untitled) /Trapped /False >> endobj 10 0 obj << /Count 1 /First 11 0 R /Last 11 0 R /Type /Outlines >> endobj 11 0 obj << /Dest [ 3 0 R /Fit ] /Parent 10 0 R /Title (my book) >> endobj 12 0 obj << /Count 1 /Kids [ 3 0 R ] /Type /Pages >> endobj 13 0 obj << /Filter [ /ASCII85Decode /FlateDecode ] /Length 450 >> stream Gat='bA+pK&A70Vp6`3pCKIfXpXXq#>XE`KjPigqVW;;nW$1g%4&QFMdnYK4#peu`m!-dNn8MJG2:7tipn!=rg^CBD%(S)-DLcg-I$M#`@\%+qjr@r8Srp'N,hKQMI$nqaIG(i&M?*`7@"8Ba5[#U;!#&cU>dGK6gQ9&D.AmlVp6X2dK2?$]1YCAE(:OsG(1gW.8(2K@/gh1tBn@jk$:G&p"K%tfdI\oG=+kQ"WZ>&Z3YeA$+-#A%.B>(%e]Xu?X%'9r4Cau^:R:WsX'neNS$8j=Z1`NJM,F=T_c>I*^>6`tI_Uq%lWLQ"^.4*YNos-CNLuR)CqYap-+Cm_B[t\GC4nnS1gkh:YQ.3K)T(:g[m/XIepPN\Ln#(!NXb:'G\W;SfGlkV)0'O#SqFbPLn1VLk6>Xc*&p*ZQ.hrUSj7"s:n/$&/~>endstream endobj xref 0 14 0000000000 65535 f 0000000073 00000 n 0000000116 00000 n 0000000223 00000 n 0000000428 00000 n 0000001403 00000 n 0000025290 00000 n 0000025529 00000 n 0000026397 00000 n 0000026483 00000 n 0000026779 00000 n 0000026853 00000 n 0000026928 00000 n 0000026988 00000 n trailer << /ID [<626665cdd203958c46b2bcb275934ba5><626665cdd203958c46b2bcb275934ba5>] % ReportLab generated PDF document -- digest (http://www.reportlab.com) /Info 9 0 R /Root 8 0 R /Size 14 >> startxref 27529 %%EOF