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  1. or download this
    $ cat test.pl
use 5.20.0;
...
1,2,3,5,6
1,2,4,5,6
1,2,3,5,6
  2. or download this
    $ cat test.pl
use 5.20.0;
...
"1","2","3","5","6"
"1","2","4","5","6"
"1","2","3","5","6"
  3. or download this
    $ perl -MText::CSV_XS=csv -e'csv (in => "test.csv", blank_is_undef => 
+1, quote_always => 1, on_in => sub { splice @{$_[1]}, 2, 2, $_[1][2] 
+// $_[1][3]; });'
"1","2",,"5","6"
"1","2","3","5","6"
"1","2","4","5","6"
"1","2","3","5","6"