GrantPermission instances. The implies method of the returned PermissionCollection instance is defined as follows: for a given GrantPermission g, let c(g) denote the set of all permissions contained within g or within arbitrarily nested GrantPermissions inside g, excluding nested GrantPermissions themselves. Then, a GrantPermission g is implied by the PermissionCollection pc if and only if each permission in c(g) is implied by the union of c(p) for all p in pc. Implication of contained java.security.UnresolvedPermissions is special-cased: an UnresolvedPermission p1 is taken to imply another UnresolvedPermission p2 if and only if the serialized representations of p1 and p2 are identical.
@return newly created empty mutable permission collection forGrantPermissions
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