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$6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{6^{}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}$
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#4600: Displace_
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$p(i,j)=\frac{j-1}{k-1}p(i-1,j)+\frac{k-j+1}{k-1}p(i-1,j-1),p(1,1)=1$
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Two Planet Approach the Roche Limit
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