11.   In recent weeks, an underground group of students calling themselves the Escher Society has been replacing the ads with photocopies of the work of the artist M.C. Escher.

12.   In San Francisco, by contrast, an underground civic group called the San Francisco Print Collective has distributed posters calling for arming the homeless.

13.   In the Cadillac, police also recovered paraphernalia from the North America Man-Boy Love Assocation, an underground group that advocates consensual sex between men and boys.

14.   Irgun was named after the Jewish underground group that fought the British and the Arabs a half century ago in what is now Israel.

15.   Petru Lorenzi, a leader of the largest underground Corsican nationalist group, was killed, and another leader, Charles Pieri, was seriously injured.

16.   The underground group is a cover, police said, for a splinter group of the Ulster Defense Association, which claims to be abiding by a fragile cease-fire.

17.   Then he set up an underground Resistance group named Phratrie.

18.   They belonged to the underground Lehi group, often called the Stern Gang, and to them Bernadotte was no neutral peacemaker.

19.   Unapproved cults, sects and underground religious groups are prospering as communist ideology loses its appeal in the rapidly changing society.

20.   We have survived the abuse and formed an underground group in the Internet where Miss Stint will never find me.