The sentences that should be included in a summary of the text are:
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John Fitch combined old methods of constructing boats with new technology to create the first steamboats.
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It wasn’t until after his death that Robert Fulton created a commercially successful steamboat and became known as “the father of steam navigation.”
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Fitch's boats cost too much to make.
The first sentence captures Fitch's innovative approach, the second highlights Fulton’s eventual recognition, and the third addresses the financial challenges that Fitch faced. The first option is not relevant to the summary.