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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/introd=
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/conten=
t.htm">=C4=BF=C2=BC</A></TD>
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/101.ht=
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/201.ht=
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m">6</A></TD>
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/701.ht=
m">7</A></TD>
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/801.ht=
m">8</A></TD>
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/901.ht=
m">9</A></TD>
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/1001.h=
tm">10</A></TD>
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/EP.htm=
">=CE=B2=C9=F9</A></TD>
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/REF.ht=
m">=B2=CE=BF=BC=CE=C4=CF=D7</A></TD>
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/EE.htm=
">=BA=F3=BC=C7</A></TD>
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tm">=CB=F7=D2=FD</A></TD></TR></TBODY></TABLE></FONT>
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    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/801.ht=
m">8.1</A></TD>
    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/802.ht=
m">8.2</A></TD>
    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/803.ht=
m">8.3</A></TD>
    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/804.ht=
m">8.4</A></TD>
    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/805.ht=
m">8.5</A></TD>
    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/806.ht=
m">8.6</A></TD>
    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/807.ht=
m">8.7</A></TD></TR></TBODY></TABLE></FONT></CENTER>
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<H2>8.7=C8=FD=B3=E1=D3=A5=D3=B3=C9=E4</H2>
<P>=B1=BE=BD=DA=B8=F8=B3=F6=B5=C4=D3=B3=C9=E4=BA=DC=C8=DD=D2=D7=D0=B4=B3=F6=
=CB=E3=B7=A8=BA=CD=B3=CC=D0=F2=A3=AC=B5=AB=B5=FC=B4=FA=B9=AB=CA=BD=C8=B4=B2=
=BB=C8=DD=D2=D7=BC=F2=B5=A5=B5=D8=D0=B4=B3=F6=A3=AC=D3=C3=CB=FC=BF=C9=D2=D4=
=C9=FA=B3=C9=B4=F8 =
=D3=D0=C8=FD=B8=F6=B3=E1=B0=F2=B5=C4=D0=DB=D3=A5=A3=AC=CB=F9=D2=D4=B3=C6=CB=
=FC=C8=FD=B3=E1=D3=A5=D3=B3=C9=E4=A1=A3=BC=C6=CB=E3=A1=B0=C8=FD=B3=E1=D3=A5=
=A1=B1=B5=C4=B3=CC=D0=F2=C8=E7=CF=C2=A3=BA</P>
<P>
<UL><PRE>{Feath.pas Generating animal feathers!}
uses Graph,Dos,Crt;
var
     x,y,k,aa,b,c,d:real;
     w,z,u,xnew,ynew:real;
     Gd,Gm,i,n,p:integer;
begin
Gd:=3DDetect; InitGraph(Gd,Gm,'D:\PASCAL');
aa:=3D-0.45; b:=3D0.93; c:=3D2-2*aa;
x:=3D1; y:=3D1;
w:=3Daa*x+c*(x*x)/(1+x*x);
repeat
       PutPixel(round(x*30)+250,200-round(y*25),15);
       z:=3Dx;
       x:=3Db*y+w;{-x/3.5}
       u:=3Dx*x; {/2}
       w:=3Daa*x+c*u/(1+u); {(1+u+x/4) ,or 3,5}
       y:=3Dw-z;
until KeyPressed;
CloseGraph;
end.</PRE></UL><PRE></PRE>
<P></P>
<P>=D5=E2=B8=F6=B3=CC=D0=F2=BC=F2=B5=A5=CD=B8=C1=CB=A3=AC=B5=AB=D7=F7=B3=F6=
=B5=C4=CD=BC=D0=CE=C8=B4=B2=BB=D2=BB=B0=E3=A1=A3=D0=DE=B8=C4=C4=B3=D0=A9=CF=
=EE=A3=AC=BF=C9=D2=D4=C8=C3=B3=E1=B0=F2=CF=B8=D0=A9=A1=A2=D3=D0=B2=A8=CE=C6=
=B5=C8=B5=C8=A1=A3=20
=D5=E2=B8=F6=C0=FD=D7=D3=B8=F8=CE=D2=C3=C7=D2=BB=B8=F6=C6=F4=CA=BE=A3=BA=CE=
=D2=C3=C7=C9=F5=D6=C1=B2=BB=B1=D8=D6=AA=B5=C0=D3=B3=C9=E4=B5=C4=BE=DF=CC=E5=
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=A8=A3=AC=B2=BB=20
=B6=CF=D0=DE=B8=C4=A3=AC=B1=E3=BF=C9=D2=D4=D7=F7=B3=F6=BA=C3=BF=B4=B5=C4=CD=
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=B5=C4=B6=C1=D5=DF=BF=C9=D2=D4=BF=BC=C2=C7=B2=C9=C8=A1=A1=B0=CC=E5=BB=E6=D6=
=C6=A1=B1=B7=BD =
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=FD=CE=AC=C1=A2=CC=E5=CD=BC=A1=A3</P>
<P>=D3=C3=D3=B3=C9=E4=B5=C4=B0=EC=B7=A8=C9=FA=B3=C9=B8=DF=BE=AB=B6=C8=B5=C4=
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=A1=C1768=A1=A3=B1=D8=D2=AA=CA=B1=D2=B2=BF=C9=D2=D4=CF=C8=BD=AB=CA=FD=BE=DD=
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=B7=D1=20
=CA=B1=BC=E4=A3=AC=B5=AB=D3=D0=CA=B1=D2=B2=D6=B5=B5=C3=CA=D4=CA=D4=A1=A3=CB=
=B3=B1=E3=D2=BB=CC=E1=A3=AC=B7=D6=D0=CE=CD=BC=B5=C4=BE=AB=B6=C8=D7=EE=BA=C3=
=D3=C3=CF=F3=CB=D8=B8=F6=CA=FD=C0=B4=BA=E2=C1=BF=A3=AC=B6=F8=B2=BB=CA=C7=CF=
=F1=CD=A8=B3=A3 =
=C4=C7=D1=F9=D3=C3=B6=E0=C9=D9DPI=C0=B4=BA=E2=C1=BF=A1=A3=D6=BB=D2=AA=CF=F3=
=CB=D8=D7=E3=B9=BB=B6=E0=A3=AC=B7=D6=D0=CE=CD=BC=B5=C4=D6=CA=C1=BF=BE=CD=D3=
=D0=B1=A3=D5=CF=A1=A3</P>
<P>
<CENTER><IMG=20
src=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/p814.gi=
f">
<P></P>
<P>=CD=BC8.14 =C8=FD=B3=E1=D3=A5=D3=B3=C9=E4=CD=BC=C6=D7</CENTER></P>
<P>
<HR width=3D"100%">

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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/pref1.=
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    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/101.ht=
m">1</A></TD>
    <TD><A=20
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href=3D"http://www.phil.pku.edu.cn/personal/huajie/fractalart/html/201.ht=
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123

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