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4. Check against backup copy (see Edit/Preferences for automatic backups).
5. Check if used = when wanted: = (or vice versa).
6. ”; unexpected": possibly unbalanced parentheses.
7. empty plot: numerical values for parameters may not be assigned.
8. ... instead of [...], or vice versa.
9. wrong number (or type) of parameter, invalid arguments a symbolic variable may be numeric, or vice versa.
10. No response from Maple: Maple gave up. Try numerical evaluation, if that works then the problem is not you. May need to assign variable type to assist Maple.
11. No action: forgotten “;” to end line.
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