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  a + b.c - 1.3 * 2 + 3

  @tree = qw(a + b.c - 1.3 * 2 + 3);

  %found = ('+' => 85, '-' => 85, '*' => 90)

  ['*', ['+', 'a', ['-', 'b.c', 1.3]], ['+', 2, 3]]

=head1 VARIABLE PARSE TREE

...

    [% USE cet = CGI::Ex::Template %]
    [%~ cet.dump_parse('foo.bar + 2').replace('\s+', ' ') %]

$OPERATORS = [
    # type      precedence symbols              action (undef means pl
+ay_operator will handle)
...
    ['infix',   45,        ['and', 'AND'],      undef                 
+                      ],
    ['infix',   40,        ['or', 'OR'],        undef                 
+                      ],
];