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## Class org.apache.commons.configuration.`AbstractConfiguration`

Removed Methods
`boolean` containsKey(`String`) | {@inheritDoc}
`Iterator` getKeys() | {@inheritDoc}
`boolean` isEmpty() | {@inheritDoc}

Added Methods
`void` `append`(`Configuration`) | Appends the content of the specified configuration to this configuration.
`void` `copy`(`Configuration`) | Copies the content of the specified configuration into this configuration.
`Configuration` `interpolatedConfiguration`() | Returns a configuration with the same content as this configuration but with all variables replaced by their actual values.

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