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| dune of the longitudinal type | |||
| dune of longitudinal type | |||
| longitudinal dune | |||
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纵沙丘 : 40 phrases in 6 subjects |
| Arabic language | 9 |
| Desert science | 25 |
| French | 2 |
| Oil / petroleum | 1 |
| Technology | 2 |
| Wind Energy | 1 |
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