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Buy 0.8 from the market, transfer to your account and buy a CL pack. You will be able to tell this story to your grandkids in future :)

Alright! I will do this now!

This sound likes a dumb question: Shoul I keep the Voucher in hope to price increase or open it? :D

You can't "open" a voucher. You can only open a pack, when opening is allowed on December 8th.

Thank you :)