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Unsourced material may be challenged and removed. No assumption is made about the nature of the symbols. The reverse of a string is a string with the same symbols but in reverse order. A number of additional operations on strings commonly occur in the formal theory. Use of these with existing code led to problems with matching and cutting of strings, the severity of which depended on how the character encoding was designed. ASCII range will represent only that ASCII character, making the encoding safe for systems that use those characters as field separators. These encodings also were not “self-synchronizing”, so that locating character boundaries required backing up to the start of a string, and pasting two strings together could result in corruption of the second string.