var input = [[1, 2], [2, 3], [2, 1]];
Output: [[1, 2], [2, 3]]
For further actions, you may consider blocking this person and/or reporting abuse
var input = [[1, 2], [2, 3], [2, 1]];
Output: [[1, 2], [2, 3]]
For further actions, you may consider blocking this person and/or reporting abuse
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