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No parameters edit
{{Error:must be substituted}}
This template must be substituted. Replace {{{{{1}}} with {{subst:{{{1}}}.
{{Error:must be substituted/sandbox}}
This template must be substituted. Replace {{{{{1}}}|content=< redirect's contents >}} with {{subst:{{{1}}}|content= < redirect's contents >}}.
Single parameter edit
{{Error:must be substituted|Foobar}}
This template must be substituted. Replace {{Foobar with {{subst:Foobar.
{{Error:must be substituted/sandbox}}
This template must be substituted. Replace {{Foobar|content=< redirect's contents >}} with {{subst:Foobar|content= < redirect's contents >}}.