thanks very much for your help, but I think that I'm missing something fundamental here...
isn't for the third element of @array 
grep {@$_} @arrays

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yielding 
grep { 1,2 } @arrays

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when dereferenced? and that expression is true as processed by the comma operator,so that the [[1,2]] array ends up in @filtered?

In reply to Re^4: Perlsecret - plus no-ops by Anonymous Monk
in thread Perlsecret - plus no-ops by Anonymous Monk

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