An "array of arrays" is in fact an array of references to arrays. So each element of your @M is an array reference leading us to: 
foreach $aref (@M) {...

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To get the actual array from an array reference, one usually writes @$aref leading us to 
    foreach $element (@$aref) {...

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and that's all about it.

In reply to Re: Re: multi-dimensional arrays, dereferencing by Skeeve
in thread multi-dimensional arrays, dereferencing by fabalicious

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