[0,4,7,8,10,11,12,13,14,15,16,17,17,18,19,20,20,
21,21,22,23,23,24,24,25,25,26,27,27,28,28,28,29,
29,30,30,31,31,32,32,32,33,33,34,34,35,35,35,36,
36,36,37,37,38,38,38,39,39,39,40,40,40,41,41,41,
42,42,42,43,43,43,44,44,44,45,45,45,45,46,46,46,
47,47,47,48,48,48,48,49,49,49,49,50]
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