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Question related to mission Behind 2048

  Sorry, there is a stituation needed to be clarified.

Fail: checkio([[[0,2,2,0],[0,0,0,0],[0,0,0,0],[0,0,0,0]],"up"])
Right result: [[0,2,2,0],[0,0,0,0],[0,0,0,0],[0,0,0,2]]

but

Fail: checkio([[[32,2,256,64],[128,32,16,32],[16,16,0,0],[0,0,0,0]],"up"])
Right result: [[32,2,256,64],[128,32,16,32],[16,16,0,0],[0,0,0,0]]

what is the difference between the two cases? why does one produce 2 but the other does not?

URL from: http://www.checkio.org/mission/simple2048/solve/
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