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| MO 22 | Missing operand: an expression con- tains an operator with no operand following it. |
| NF 1 | NEXT without FOR: a variable in a NEXT statement does not correspond to any previously executed, unmatch- ed FOR statement variable. |
| NM 55 | Bad file name: an illegal form has been used for a file name specified with LOAD, SAVE, KILL, NAME, etc. |
| NR 19 | No RESUME: an error trapping routine has been started but it contains no RESUME statement. |
| OD 4 | Out of data: a READ statement has been attempted when there are no DATA statements with unread data remaining in the program. |
| OM 7 | Out of memory: a program is too large; has too many files, FOR loops, GOSUBS, or variables; or it contains expressions that are too complex. |
| OS 14 | Out of string space: string varia- bles have caused BASIC to exceed the amount of free memory remaining. BASIC will allocate string space dynamically until it runs out of memory. |
| OV 6 | Overflow: the result of a calcula- tion is too large to be represented in BASIC'S number format. |
| RG 3 | RETURN without GOSUB: a RETURN statement has been encountered for which there is no previous, unmatched GOSUB statement. |
| RW 20 | RESUME without error: a RESUME statement has been found before an error trapping routine has been entered. |
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