1.   During the cold war East and West Berlin were sundered by an impenetrable wall.

2.   Almost imperceptibly, the cute yellow jerseys and socks of the Swedes had molded into an impenetrable golden wall, one of the best-organized defenses in world soccer.

3.   Faced with an impenetrable wall of pale blue polyester where a human being should be, you learn to look for clues.

4.   He is part of a virtually impenetrable defensive wall that has surrendered only two goals in six matches.

5.   In other words, building impenetrable electronic walls may be a more effective tactic in cyberwarfare.

6.   It creates impenetrable walls.

7.   More important, Congress could require an impenetrable wall between the financial condition of a securities subsidiary and the insured deposits of the parent bank.

8.   So we are left to look in from the outside, separated by this impenetrable wall that Belle has constructed around his persona.

9.   The law has long served as the impenetrable wall between banks and securities houses.

10.   Then they marched miles to City Hall to hold a rally, only to find barricades and an impenetrable wall of blue uniforms.