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When someone is 'detained' they are taken away from their home and kept in a centre where they are locked in and cannot come and go when they want.
To treat a person or particular group of people differently, especially in a worse way than you treat others, because of their skin colour, religion, sex or age.
Everyone is different even though you may have similarities like where you live, what music you like or where you were born. We should celebrate the fact that everyone is unique.