1.   Computer memory used to be expensive and programmers saved space by using two digits to designate the year.

2.   They marched beneath huge orange and black banners designating their years.

3.   What years would be designated that way on a set of china?

4.   The glitch threatens computers that use two digits to designate the year.

5.   The millennium bug threatens all computer programs that use only the last two digits to designate a year.

6.   The millennium bug threatens all computer software and chips that, to save programming space, use just the last two digits to designate a year.

7.   The so-called millennium bug threatens computer programs that use just the last two digits to designate a year.