Hi, First, please note that all are incorrect because they lack capital letters. 'visa,mastercard, and citibank are all acceptable' OK or 'visa,mastercard, and citibank all are acceptable' OK, but less elegant what if i modify the 2nd sentence as: 'visa,mastercard, and citibank:all are acceptable' can just a list of nouns stand like this before the colon? No.
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