src/main/java/org/apache/commons/io/input/NullInputStream.java [203:219]:
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    @Override
    public synchronized void mark(final int readLimit) {
        if (!markSupported) {
            throw UnsupportedOperationExceptions.mark();
        }
        mark = position;
        this.readLimit = readLimit;
    }

    /**
     * Tests whether <em>mark</em> is supported.
     *
     * @return Whether <em>mark</em> is supported or not.
     */
    @Override
    public boolean markSupported() {
        return markSupported;
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src/main/java/org/apache/commons/io/input/NullReader.java [175:191]:
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    @Override
    public synchronized void mark(final int readLimit) {
        if (!markSupported) {
            throw UnsupportedOperationExceptions.mark();
        }
        mark = position;
        this.readLimit = readLimit;
    }

    /**
     * Indicates whether <em>mark</em> is supported.
     *
     * @return Whether <em>mark</em> is supported or not.
     */
    @Override
    public boolean markSupported() {
        return markSupported;
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