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use Template;
my $tt = Template-new();
...
              array_param => \@array,
              hash_param => \%hash
                                        } ) or die $tt->error();

Hello [% name %], how are you doing on this fine
[%- IF hour < 11 -%]
...
evening
[%- END -%]
?

#
# .. from perl ..
...
[% FOREACH grade = data.grades %]
  [% grade %]
[% END %]