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Beskrivelse
Sandwich is a logic puzzle invented by Naoki Inaba (Japan). A rectangular or square grid contains numbers in some cells. The task is to blacken some empty cells according to the rules:• All white cells must be divided on regions having the size of exactly three cells. • Two black cells must not be orthogonally adjacent. • Each region contains a number. • A number indicates how many black cells share an edge with that region.
