51-60 most frequent mandarin chinese characters.

Popularity (by total correct streak): 132
Popularity (by number of users): 10

Cards

yong4 to use  
dao4 direction/way/method/road/path/principle/truth/reason/skill/method/Tao (of Taoism)/a measure word/to say/to speak/to talk  
hang2/xing2/xing4 a row/profession/professional, all right/capable/competent/OK/okay/to go/to do/to travel/temporary/to walk/to go/will do, behavior/conduct  
suo3 actually/place  
ran2 correct/right/so/thus/like this/-ly  
jia1 furniture/tool, -ist/-er/-ian/home/family/a person engaged in a certain art or profession  
zhong3/zhong4 kind/type/race/breed/seed/species (taxonomy), to plant/to cultivate  
shi4 matter/thing/item/work/affair  
cheng2/cheng4 finish/complete/accomplish/become/turn into/win/succeed/one tenth, finish/complete/accomplish/become/turn into/win/succeed/one tenth  
fang1 square/quadrilateral/direction/just  

Quisition is a browser-based flashcard system that repeats old cards and introduces new ones at optimal time intervals. You can create your own card packs or use those developed by others.