commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/OpenIntToDoubleHashMap.java [535:584]:
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            throws ConcurrentModificationException, NoSuchElementException {
            if (referenceCount != count) {
                throw new ConcurrentModificationException();
            }
            if (current < 0) {
                throw new NoSuchElementException();
            }
            return values[current];
        }

        /**
         * Advance iterator one step further.
         * @exception ConcurrentModificationException if the map is modified during iteration
         * @exception NoSuchElementException if there is no element left in the map
         */
        public void advance()
            throws ConcurrentModificationException, NoSuchElementException {

            if (referenceCount != count) {
                throw new ConcurrentModificationException();
            }

            // advance on step
            current = next;

            // prepare next step
            try {
                do {
                    ++next;
                } while (states[next] != FULL);
            } catch (ArrayIndexOutOfBoundsException e) {
                next = -2;
                if (current < 0) {
                    throw new NoSuchElementException();
                }
            }
        }
    }

    /**
     * Read a serialized object.
     * @param stream input stream
     * @throws IOException if object cannot be read
     * @throws ClassNotFoundException if the class corresponding
     * to the serialized object cannot be found
     */
    private void readObject(final ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        count = 0;
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/OpenIntToFieldHashMap.java [547:596]:
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            throws ConcurrentModificationException, NoSuchElementException {
            if (referenceCount != count) {
                throw new ConcurrentModificationException();
            }
            if (current < 0) {
                throw new NoSuchElementException();
            }
            return values[current];
        }

        /**
         * Advance iterator one step further.
         * @exception ConcurrentModificationException if the map is modified during iteration
         * @exception NoSuchElementException if there is no element left in the map
         */
        public void advance()
            throws ConcurrentModificationException, NoSuchElementException {

            if (referenceCount != count) {
                throw new ConcurrentModificationException();
            }

            // advance on step
            current = next;

            // prepare next step
            try {
                do {
                    ++next;
                } while (states[next] != FULL);
            } catch (ArrayIndexOutOfBoundsException e) {
                next = -2;
                if (current < 0) {
                    throw new NoSuchElementException();
                }
            }
        }
    }

    /**
     * Read a serialized object.
     * @param stream input stream
     * @throws IOException if object cannot be read
     * @throws ClassNotFoundException if the class corresponding
     * to the serialized object cannot be found
     */
    private void readObject(final ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        count = 0;
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