The presence of errors in software development (and not only) is inevitable. However, over time the programs improve and tend to perfection through various techniques and methods we have developed.

The deterministic problems are easy to spot because they always lead to the same error. There are tools that run through the source code of an application to find possible deterministic errors (these tools are especially useful in applications written with scripting languages such as Python, Bash Scripting, etc).

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