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impedance factor
abbr., progr.
difficulty factor
(
ssn
)
impedance
:
630 phrases
in 38 subjects
Analytical chemistry
1
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15
Astronomy
6
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1
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1
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2
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43
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9
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25
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2
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163
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36
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2
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2
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15
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2
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11
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34
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4
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76
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