Assertion: lignite | /r/HasProperty | lesser form of coal
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Source sentences:
text: From experimentation, it was finally determined that the problem in using the prior art type furnaces resulted from the fact that lignite being a lesser form of coal and containing approximately thirty-five percent water, was a much more complex material to carbonize in the furnace since the volatile content of lignite was much more complex compared to the wood previously carbonized in the furnaces.