src/main/java/org/apache/maven/resolver/internal/ant/types/Proxy.java [114:129]:
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    public Authentication getAuthentication() {
        if (isReference()) {
            return getRef().getAuthentication();
        }
        return authentication;
    }

    public void addAuthentication(Authentication authentication) {
        checkChildrenAllowed();
        if (this.authentication != null) {
            throw new BuildException("You must not specify multiple <authentication> elements");
        }
        this.authentication = authentication;
    }

    public void setAuthRef(Reference ref) {
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src/main/java/org/apache/maven/resolver/internal/ant/types/RemoteRepository.java [225:240]:
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    public Authentication getAuthentication() {
        if (isReference()) {
            return getRef().getAuthentication();
        }
        return authentication;
    }

    public void addAuthentication(Authentication authentication) {
        checkChildrenAllowed();
        if (this.authentication != null) {
            throw new BuildException("You must not specify multiple <authentication> elements");
        }
        this.authentication = authentication;
    }

    public void setAuthRef(Reference ref) {
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