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function f=a1(r)
x=r(1);y=r(2);
m=0£»
for i=1:5
     x=x*i
  for j=2:6
      ¡£¡£¡£¡£¡£
      y=y*j£»
   if   x*y>20
      m=m+x*y£»
      end
   end
end
f=1/m£»

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