Yes, after looking into it, some of my patterns are the same. Maybe a reason
to  trust a single invocation more...


Reuben Thomas wrote:
> 
> 
> More likely your patterns aren't all different, so when you split them up 
> some match twice, whereas if you supply redundant patterns to a single 
> invocation of grep they only match once:
> 
> 
> 

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