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extern DNS_RR *dns_rr_copy(DNS_RR *);
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extern DNS_RR *dns_rr_append(DNS_RR *, DNS_RR *);
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extern DNS_RR *dns_rr_sort(DNS_RR *, int (*) (DNS_RR *, DNS_RR *));
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extern int dns_rr_compare_pref(DNS_RR *, DNS_RR *);
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extern DNS_RR *dns_rr_shuffle(DNS_RR *);
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extern DNS_RR *dns_rr_remove(DNS_RR *, DNS_RR *);