The answer is:
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"no error".
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The comma is correctly placed before the conjunction "for"; and in this instance in which the word, "for", is used, a comma is necessary. No other part of the sentence needs—or requires—a comma, and there are no commas that are placed unnecessarily.
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As a side note, I would recommend that the first letter of the first word in the sentence: "Abbey", be capitalized, because:
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1) It is the first word at the beginning of the sentence; and:
2) It is someone's name, which is a proper noun.
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I also recommend placing a "period" at the end of the sentence.
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To read:
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<span>Abbey is most interested in learning how to mount her horse, for she already knows several things about dressage.
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Answer:
UNK the , . of and in " a to was is ) ( for as on by he with 's that at from his it an were are which this also be has or : had first one their its new after but who not they have – ; her she ' two been other when there all % during into school time may years more most only over city some world would where later up such used many can state about national out known university united then made ..
Explanation: