51.   The network equipment used to relay the voice data over the Internet is also cheaper than technology used within telephone systems, analysts said.

52.   The travel must be used within a month.

53.   The whole ticket generally must be used within one year.

54.   They can, however, be used within common-sense safety guidelines.

55.   This is a cylinder that, as you roll it, displays an onscreen version that presents programs that can be run, or commands used within specific programs.

56.   Those who wait until next year to buy passes will not only be subject to higher prices but will also have to use them within three months of purchase.

57.   Two of the bombs were used within the last week.

58.   Unless the beans are used within a few days, it might pay to buy whole or ground beans in bags or tins designed to keep the coffee fresh.

59.   Use it within a day of buying it or freeze it and use it within three months.

60.   Use them within one to two days for best quality.