[Q]: Sentence: Still, it remained difficult for manufactures to reliably determine film speeds, often only by comparing with competing products, so that an increasing number of modified semi-Scheiner-based systems started to spread, which no longer followed Scheiner's original procedures and thereby defeated the idea of comparability. Question: What method did manufacturers use much of the time to compare film speeds?
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[A]: yes

[Q]: Sentence: First, he would seize Saxony and eliminate it as a threat to Prussia, then using the Saxon army and treasury to aid the Prussian war effort. Question: What was one goal of the invasion of Saxony?
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[A]: yes

[Q]: Sentence: Efforts to identify the origins of Ashkenazi Jews through DNA analysis began in the 1990s. Question: When did efforts begin to try and identify the origins of Ashkenazi Jews through DNA analysis?
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[A]:
yes