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<select name="f_course">
<option value="Select Course">Select Course</option>
...
<option value="2003">2003</option>
<option value="2002">2002</option>
</select>

my $profile = {
optional => [qw( f_course f_month f_year )],
...
    # Or if f_year is entered, make f_course and f_month required
  },
};