Questions on 'space technology' category
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21
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25
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23
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17
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20
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17
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18
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17
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48
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48
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48
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52
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44
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43
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43
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43
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73
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66
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61
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55
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50
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55
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answer
60
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51
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76
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73
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76
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61
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56
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55
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59
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50
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68
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71
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62
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