Achieving a letter streak
devilonhigh
There can be a stamp that indicates writing to someone for 10 days or X days in a row and getting reply from them in same fashion (1:1 or higher) during that streak.
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RTJ844
i would like to suggest little modification here.. as it is a letter we are talking about, so instead of counting day wise streak, we can count week wise streak. and if the person sends at least one letter per week to particular pen pal without fail for 12 weeks then they get the letter streak achievement stamp.