src/main/java/org/apache/commons/collections4/bag/AbstractMapBag.java [117:140]:
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    protected static class MutableInteger {

        /** The value of this mutable. */
        protected int value;

        /**
         * Constructs a new instance.
         * @param value the initial value
         */
        MutableInteger(final int value) {
            this.value = value;
        }

        @Override
        public boolean equals(final Object obj) {
            if (!(obj instanceof MutableInteger)) {
                return false;
            }
            return ((MutableInteger) obj).value == value;
        }

        @Override
        public int hashCode() {
            return value;
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src/main/java/org/apache/commons/collections4/multiset/AbstractMapMultiSet.java [197:219]:
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    protected static class MutableInteger {
        /** The value of this mutable. */
        protected int value;

        /**
         * Constructs a new instance.
         * @param value the initial value
         */
        MutableInteger(final int value) {
            this.value = value;
        }

        @Override
        public boolean equals(final Object obj) {
            if (!(obj instanceof MutableInteger)) {
                return false;
            }
            return ((MutableInteger) obj).value == value;
        }

        @Override
        public int hashCode() {
            return value;
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