1.   Others say the public rage is simply a reflection of frustrations among citizens who feel walled off by an impenetrable bureaucracy.

2.   Owners of small farms, like Bonilla, complain about the lack of credit and the impenetrable bureaucracy.

3.   She, like hundreds of counterparts around the country, is frustrated by slumping student achievement, unsafe schools and impenetrable bureaucracies.

4.   That code word means that you must search for invasions of your privacy from punch-this-number telephone-answering computers and impenetrable bureaucracies.