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Each of the four-field areas holds one of the right sets. None set occurs twice. The signs indicate the subset relations. All subset relations between orthogonal neighboring sets are given.

Example:

Puzzle:

Each of the four-field areas holds one of the right sets. None set occurs twice. The signs indicate the subset relations. All subset relations between orthogonal neighboring sets are given.

Example:

Puzzle:

Each of the four-field areas holds one of the right sets. None set occurs twice. The signs indicate the subset relations. All subset relations between orthogonal neighboring sets are given.

Example:

Puzzle: