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[% SET a = { a=1 b=2 c=3 } -%]
[% CALL a.import({ a=2 b=1 d=4 e=5 }) -%]
[% a.exists('c') ? 1 : 0 %]
[% a.exists('d') ? 1 : 0 %]
[% a.a %]
[% a.e %]