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this fixes a rare situation:
if you had a row with
11133
, and moved right, you would get:...333
But if you moved left on the same row, you would get:
9....
Conversely, if you had a row with
33111
and moved left, you would get:333..
But if you moved right on the same row, you would get:
....9
A similar situation occurs with vertical moves and similar tile patterns in columns.