It’s a (non secret) code.
In the most familiar systems, groups of eight bits often encode one letter. Ignoring the first “01” in your eighteen-bit example, “01001010 01010010” means “JR”.
There are 128 ways you can combine seven bits, which is enough to assign a combination to each of the English capital and lowercase letters, digits and special symbols you see on a typical keyboard.
With the addition of the 8th bit, which is the first 0 in each of those two groups you gave, you now have the possibility of either encoding 128 more of your favorite non-English letters and funny symbols, or doing something more complicated in which a 1 in the first position signals that you’re using more than one group to encode a single character.
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