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ok hi here& #39;s a comparison between 4 pc wanderer& #39;s and 4 pc crimson witch for yanfei based on my calculations:
wanderer& #39;s 2 pc effect is 80 elem mastery, which increases the dmg caused by melt/vaporize by 15%, which is equal to one of the effects in 4 pc cw, increasing melt/vapo dmg by 15%
4 pc wanderers boosts catalyst/bow charged attack dmg by 35%, however at full stacks, 4 pc crimson witch can reach 37.5% pyro dmg bonus
which, yanfei can maximize bc her skill cd is 6s
plus 4 pc cw increases overload and burning dmg by 40%, and also covers her normal atk, skill and burst dmg, not just her charged atk so
imo i& #39;d go for 4 pc cw but if you already have a good set, whether or not it& #39;s wanderers or crimson witch, go and use it
ofc all of this is naught if my math is wrong so if anyone can correct me pls do 
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