| 1 | So, laughter is kind of a puzzle. | |
| 2 | His poems are full of obscurities. | |
| 3 | How news travels through a town is a mystery not easily to be solved. | |
| 4 | Yet the relationship between education and international competitiveness is a subject rife with myth and misunderstanding. | |
| 5 | Chinese coffee is something of an enigma, even to those in the coffee industry. |
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