src/main/java/org/apache/commons/collections4/map/AbstractHashedMap.java [1114:1125]:
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        public boolean equals(final Object obj) {
            if (obj == this) {
                return true;
            }
            if (!(obj instanceof Map.Entry)) {
                return false;
            }
            final Map.Entry<?, ?> other = (Map.Entry<?, ?>) obj;
            return
                (getKey() == null ? other.getKey() == null : getKey().equals(other.getKey())) &&
                (getValue() == null ? other.getValue() == null : getValue().equals(other.getValue()));
        }
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src/main/java/org/apache/commons/collections4/keyvalue/AbstractMapEntry.java [64:75]:
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    public boolean equals(final Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof Map.Entry)) {
            return false;
        }
        final Map.Entry<?, ?> other = (Map.Entry<?, ?>) obj;
        return
            (getKey() == null ? other.getKey() == null : getKey().equals(other.getKey())) &&
            (getValue() == null ? other.getValue() == null : getValue().equals(other.getValue()));
    }
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