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use strict;
use warnings;
...
  print "EXP: $glob_expression:\n";
  print "\t", join("\n\t",  glob $glob_expression), "\n\n";
}

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 EXP: {value1};{value2};{value3,value4};{value5,value6,value7}:
        value1;value2;value3;value5
...
        value16;value18;value20;value21
        value17;value19;value20;value21
        value17;value18;value20;value21