Charles E Campbell Jr, Sat 2011-12-24 @ 22:11:31-0500:
> If I may repeat myself, what advantage does
>   set cpo-=a cpo-=A
> have over
>   set cpo-=aA
> ???

From `:help :set-=`:

                        When the option is a list of flags, {value} must be
                        exactly as they appear in the option.  Remove flags
                        one by one to avoid problems.

Removing the flags individually is guaranteed to work regardless of the
order and position in which the flags appear in the option string. This
is not true if you remove them in combination.

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