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Before: "This is difference of the stack height before and after the instruction"
After: "This is the difference in stack height before and after the instruction"
The original phrase was grammatically incorrect. "Difference in" is the proper way to describe changes in quantity.
Improved readability of the 'Undefined Instructions' section:
Before: "Undefined instructions have base gas cost 0 and not stack requirements."
After: "Undefined instructions have a base gas cost of 0 and no stack requirements."
Added "of" for clarity and changed "not stack requirements" to "no stack requirements" to make it sound more natural.