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Fix typo when demonstrating variables.
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@ -130,8 +130,8 @@ variable age \ ok
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\ Finally we can print our variable using the "read" word `@`, which adds the
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\ value to the stack, or use `?` that reads and prints it in one go.
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age @ . \ 12 ok
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age ? \ 12 ok
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age @ . \ 21 ok
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age ? \ 21 ok
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\ Constants are quite simiar, except we don't bother with memory addresses:
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100 constant WATER-BOILING-POINT \ ok
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