As ssandv said, show us your code (and you data)!

That aside, possibly you ought be using a hash of arrays (HOA) keyed by the prefix string rather than what sounds like an array of arrays (AOA, or more often: LOL (list of list)).

True laziness is hard work

In reply to Re: to group array items or not to group array items by GrandFather
in thread to group array items or not to group array items by hellworld

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