[0,1,2,10,11,12,20,21,100,101,102,110,120,200,201,
210,1000,1001,1002,1010,1011,1012,1020,1021,1100,
1101,1102,1200,1201,2000,2001,2010,2011,2100,2101,
10000,10001,10002,10010,10011,10012,10020,10021,
10100,10110,10120,10200,10210,11000,11001,11002,
11010,11011,11020,12000,12001,12010,20000,20001]
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