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Notes:
In this example we see another lovely Algol operator for the infix inclusive OR operation - it is not the letter V! Consider that people have spent hundreds of thousands of 1960 dollars on custom hardware to get this quality of notation. Today, with out bitmap displays and Unicode character sets this and much better notations could be had for no extra cost - yet we do not use them.
From the intention we see that the condition involves our friend, the boolean called "introuble" that was set with the 8 bit.