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Waiting for Blast Off

Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

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.

Blast Off

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?