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The sequence is based on the stacking of the sides of an ordinary die - step
by step in ascending order. At each stage if a pip overlaps previously
stacked pips they all are shaded. Otherwise, if the new pip doesn't overlap
any previous pip it remains white. Thus, the final pattern is either a
or b - as shown in the illustration.
Since this was a puzzle of the Holiday Edition 2007, all pips are replaced
with festive ornaments - blue and white ones respectively. |
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