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'Shunting Puzzle' printed from https://nrich.maths.org/
Why do this
problem?
This problem is not for the faint hearted! It requires logical
thinking and perseverance. Learners who enjoyed this problem may
like to try
Single Track .
Key questions
How could you start?
How will you remember what you have tried?
Remember that the engine can push and pull.
Perhaps using some counters will help?