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 [%- IF foo %]World[% END %]!
Hello[% IF bar %] World[% END %]!
Hello[% UNLESS foo %] World[% END %]!
Hello[% UNLESS bar %] World[% END %]!
[% IF foo -%]
foo
[%- ELSE -%]
bar
[%- END -%]
[% IF bar %]
BAR
[% ELSE %]
FOO
[% END -%]