code: @Override
      public V remove(final Object key) {
          final Iterator<Map.Entry<K, V>> iterator = entries.iterator();
          V lastValue = null;
  
          while (iterator.hasNext()) {
              final Map.Entry<K, V> entry = iterator.next();
              lastValue = entry.getValue();
  
              if (key.equals(entry.getKey())) {
                  iterator.remove();
              }
          }
  
          return lastValue;
      }
docs: Remove all entries for the given key
  @param key The key
  @return Some value that was paired with the key. The exact value is indeterminate