Receive xMMF when you stake in our farm or pool.\
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xMMF is a locked MMF token which is redeemable for 1:1 MMF after 21 days.\
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Any early unlock would result in a redemption rate lower than 1. Lock time ranges from 3-21 days. Minimum lock time is 3 days. \
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Its a linear unlock meaning if you withdraw on 4th day, you will get 4/21 \* MMF for redemption of 1 xMMF. \
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If you withdraw on the 21 day, you will get 21/21 MMF = 1 MMF for redemption of 1 xMMF\
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Eg, the earlier you unlock your xMMF, the lesser MMF you will receive when you redeem xMMF.
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