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    This is actually quite elegant solution - you can see right away what you are doing in small java code. Just use java (it is there on your machine most of the time already): put the code above into "unab.java", call "javac unab.java" from the command line and then call "java unab YUORFILE.ab" and that is it. Thanks! Commented Nov 26, 2021 at 15:25