For each reference, create a signature string. Two references you consider different must have different signatures. Two references you consider identical must have identical signatures. Use a hash keyed by these signatures to identify duplicates. 

my %seen;
@AoD = grep !$seen{ join(',', @$_) }++, @AoD;

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In reply to Re: Eliminate Array of array duplication by ikegami
in thread Eliminate Array of array duplication by Kandankarunai

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