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The inside diameter of a sample tube is $50 \; \text{mm}.$ The inside diameter of the cutting edge is kept such that the Inside Clearance Ratio $\text{(ICR)}$ is $1.0 \%$ to minimize the friction on the sample as the sampler tube enters into the soil.

The inside diameter (in $\text{mm}$) of the cutting edge is _______________. (round off to two decimal places)

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