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A word is a sequence of arbitrary characters (expcept white space). Words are separated by white space. E.g., each of the following lines contains exactly one word:
word !@#$%^&*() 1234567890 5!a
A frequent beginner's error is to leave away necessary white space, resulting in an error like `Undefined word'; so if you see such an error, check if you have put spaces wherever necessary.
." hello, world" \ correct ."hello, world" \ gives an "Undefined word" error
Gforth and most other Forth systems ignore differences in case (they are case-insensitive), i.e., `word' is the same as `Word'. If your system is case-sensitive, you may have to type all the examples given here in upper case.
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