There are at least 2 issues:

• @data is an array, but is being assigned an array-REF. Use Parens(), instead of square brackets[] for the outermost delimiter
• the "for" statement aliases $_ to each element. So in you case, you should be using $_ as the index, instead of your hard-coded "1" and "2"
• A perl programmer would prefer "for (@data)" instead of "for (0..$#data)"

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