| 摘要 |
An unspecified, variable bonus amount of phone card time (or some other product whose delivered value can be varied) is provided with a with a topup, where the topup amount has a fixed delivered amount in local currency and the topup is sold in other territories where foreign exchange rate fluctuations provide for a fluctuating cost of the fixed topup amount. The bonus amount may be applied to a bonus, such as a bonus phone card, that provides a hedge against exchange rate fluctuations by being a variable amount of bonus phone card time, for example, associated with the topup.
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