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Query default_* statements.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
ruletype The rule type(s) to match.
tclass The object class(es) to match.
tclass_regex If true, use a regular expression for
matching the rule's object class.
default The default to base new contexts (e.g. "source" or "target")
default_range The range to use on new context, default_range only
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