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Is the \ after the "and" a typo?

Another common use of backslash substitution is for line continuation: Continuing long commands on multiple lines. When a line ends with a backslash, the interpreter converts it and the newline following it and all whitespace at the beginning of the next line into a single space character, then evaluates the concatenated line as a single command:

iRules Optimization 101 - 04 - Delimiters: Braces, Brackets, Quotes and more by Deb Allen