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on 11 Oct 2021
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figure('Color','k')
t=0:pi/50:2*pi;
x = 5*sin(t);
y = 5*cos(t);
u=15*cos(t);
v=5*sin(t);
k=15.8*cos(t);
l=5.8*sin(t);
hold on
patch(k,l,'m')
patch(u,v,'k')
[X,Y,Z]=sphere(30);
hold on
surf(X*4,Y*4,Z*4-1)
view([-90 19.5])
a=gray;
colormap(flipud(a(randperm(256),:)));
axis([-17 17 -17 17 -5 5])
axis equal off
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