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10 space travellers are waiting to board their spaceships.
There are two rows of seats in the waiting room - a row of 10 red
chairs facing a row of 10 blue chairs.
6 people are sitting in pairs. The other 4 are sitting
alone.
Between the singles or pairs there are always one or two spare
seats.
Nobody is sitting directly opposite anyone else.
Where are they all sitting?
How can you put five cereal packets together to make different shapes if you must put them face-to-face?