'shortmess' -- is it redundent to have both "o" and "O"?

Relevant documentation: http://vimdoc.sourceforge.net/htmldoc/options.html#%27shortmess%27

My question is: is it redundant to have both "o" and "O" in the 'shortmess' option? In other words, does "O" imply "o"? If this is not the case, can anyone demonstrate the difference between the two?

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