That code leaves table as the one-dimensional array:

@table = (
"ADESFJRASLXDFRT\n"
"QBRAINOUEWHGYED\n"
"RIRURLKUNGEASDV\n"
"NAOBXCSTACHUIOL\n"
"OJKDGKJGHJUINHR\n"
"AHRHOAIDFSETRGH\n"
"RXANOGSYEROGATS\n"
"TOUDOGSDSAVFTRY\n"
"UORTUOFRHRJUIKO\n"
"BTIARTHYEUVFGQA\n"
);
[download]

But then you access it as if it were a two-dimensional array. (Your code actually will try to use symbolic references; you should enable strict so that when that happens by accident, you are alerted to it.)

So, you need to add the code that would turn the above into a two dimensional array. What is each column going to be?

You probably want to chomp(@data) after reading it to get rid of the newlines.