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The <TMPL_LOOP> tag is a bit more complicated than <TMPL_VAR>. The <TMPL_LOOP> tag allows you to delimit a section of text and give it a ... As you can see above the <TMPL_LOOP> takes a list of variable assignments and then iterates over the loop body producing output.
my $ph = [ { alpha => 1, beta => 2, gamma => 3, delta => 4, epsilon => + 5 }, #hashref ... print $ph->[1], "\n"; print $ph->{ alpha }, "\n"; print $ph->{ epsilon }, "\n";