Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Vietnamese Quoted-Readable, usually abbreviated VIQR, is a convention for writing Vietnamese using ASCII characters. Because the Vietnamese alphabet contains a complex system of diacritical marks, VIQR requires the user to type in a base letter, followed by one or two characters that represent the diacritical marks. VIQR uses DD or Dd for the Vietnamese letter , and dd for the Vietnamese letter . To type certain punctuation marks (namely, the period, question mark, apostrophe, forward slash, opening parenthesis, or tilde) directly after most Vietnamese words, a backslash () must be typed directly before the punctuation mark, so that it will not be interpreted as a diacritical mark.

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