61.   But apparently several issues left the participants deeply divided and at times, officials acknowledged, there were heated exchanges.

62.   But Armstrong just shrugged when asked what the exchange was all about.

63.   But both sides hope the exchange is meaningless.

64.   But he also reiterated his warning that the exchanges were in danger of becoming obsolete.

65.   But now, more sophisticated and computer-savvy barter exchanges have been able to increase and improve links among barterers to deliver more services.

66.   But some exchanges were less pleasant.

67.   But some members worry that the exchange is already far behind.

68.   But on many occasions the exchange is highly subtle or the laws are simply neglected.

69.   But the exchange of fire was serious enough for the mission commander to abort the salvage operation.

70.   But the exchange has hardly been one-way, she emphasized.