Not Equal: Everything in this space must be different. The answer is 2-2, placed horizontally; 4-4, placed vertically; 0-0, placed vertically.
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A BBC World Service team has spent five years filming with Squire, and other investigative units in Portugal, Brazil, and Russia - showing them solving cases such as that of a kidnapped and presumed-dead seven-year-old in Russia, and the arrest of a Brazilian man responsible for five of the biggest child-abuse forums on the dark web.