Pattern
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A pattern is simply a collection of pieces in some region of the board. The region may be near an edge, such as the ziggurat
or it could be anywhere on the board, such as the basic bridge:
A pattern can be of any size -- for example here is a pattern: a single-stone 6th row edge template.
The general notion of a pattern is useful because various important notions in Hex, such as that of an edge template or a ladder escape, are patterns.
The carrier of a pattern is the set of all cells that are part of the pattern (whether occupied by pieces or not).
