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Confusion over which instructions are executed and which are not can lead to serious programming errors and vulnerabilities , including denial of service, abnormal program termination, and data integrity violation. This problem is mitigated by the use of interactive development environments (IDEs) and editors that use fonts, colors, or other mechanisms to differentiate between comments and code. However, the problem can still manifest itself, for example, when reviewing source code printed at on a black and white printer.
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