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In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

It is implied thatat the start of the 17th century, most breweries were not what kind?, Context: Traditional English ale was made solely from fermented malt. The practice of adding hops to produce beer was introduced from the Netherlands in the early 15th century. Alehouses would each brew their own distinctive ale, but independent breweries began to appear in the late 17th century. By the end of the century almost all beer was brewed by commercial breweries.
Output:
commercial