1.   Black, yellow and white bricks were introduced to give a pattern, as were also small quantities of other materials.

2.   The ratings system was introduced to give readers a stronger feeling of involvement, says MSNBC editor in chief Merrill Brown.

3.   The game was preceded by a one-hour ceremony, during which Mayor Marion Barry was jeered loudly when he was introduced to give the welcoming speech.

4.   Last October the two sides agreed in principle that constitutional reforms would be introduced giving more power to the regions.