题目内容
当事人应当遵循（ ）原则，根据合同的性质、目的和交易习惯履行通知、协助、保密等义务。
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A pigeon is a rare bird which is able to find its way home from faraway places.
Nowadays homing pigeons are raised for postal service.
People train the young pigeons to find their way home by gradually increasing the distance they fly.
In a race, a rubber ring is placed on each participating pigeon’s leg to mark the time.
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