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1. Which of these things is transparent?
2. Which of these things is black?
3. Which of these things is blue?
4. Which of these things is beige?
5. Which of these things is violet?
6. Which of these things is rust-coloured?
7. Which of these things is grey?
8. Which of these things is yellow?
9. Which of these things is red?
10. Which of these things is green?