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Hex format gives you a view of the bit representations once you get the visualization down, because it's a power of 2 and decimal isn't. Octal is the same way, but is primarily a throwback to when busses weren't as wide. Hexadecimal requires that one invent 6 new numeric symbols (if you can call the traditional A-F an invention), whereas, with octal, you just toss a couple of the leftover ones, no imagination necessary.
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