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In Lecture 5, what does the “leading bit of the second digit” mean?

April 26, 2017lecture mean

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In Lecture 5, what does the “leading bit of the second digit” mean?

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The instruction 9F24 has 4 hexadecimal digits. The second digit is F and can be expressed in binary as 1111. So, the first (or leading) bit of the second (hexadecimal) digit is 1. Contrast with the instruction 9724. 7 is 0111 in binary. The leading bit of the second digit is 0. Where can I learn more about grep. See pages 11-25 of Unix Tools for Text Processing.