Returns the level of the lowest common ancestor of this cell and "other", that is, the maximum level such that parent(level) == other.parent(level). Returns -1 if the two cells do not have any common ancestor (i.e., they are from different faces).
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Returns the level of the lowest common ancestor of this cell and "other", that is, the maximum level such that parent(level) == other.parent(level). Returns -1 if the two cells do not have any common ancestor (i.e., they are from different faces).