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foreach (keys %clock_sheet)
        {
...
          print "$clock_sheet{$clk_name}\n";
         } 
        print "$clock_sheet{$clk_name}_name\n";

@clk_array = %clock_sheet;
print"@clk_array\_name\n";

clk1 clk1 clk2 clk2 ....... clk4 clk4_name