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  1. or download this
    @array = [8,9,10], [4,5,6], [7,8,9]; 
@sorted = sort { $a->[1] <=> $b->[1] } @array
  2. or download this
    @array = ([8,9,10], [4,5,6], [7,8,9]); 
@sorted = sort { $a->[1] <=> $b->[1] } @array