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Sentences should still make sense after removing their commas. This does not mean that commas are useless indeed this sentence is really hard to read without one in between the clauses. Yet the comma is one of the most abused punctuation on Wikipedia because they tolerates substandard writing and content stuffing. The comma test helps to detect overuse of apposition and passive voice which alone composes a majority of awkwardness in a Wikipedia article. The test may in some cases detect elegant variation and redundant phrases. Do use common sense when use the comma test because it won't work at all in lists and quotes.