fixed nested if logic
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@@ -171,7 +171,7 @@ Conditionally execute the statement that follows the expressions with the relati
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3. Set the string `EXPR1` to everything from the start of `STMT` to the character at position `ROPOS - 1` inclusively.
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4. Set the string `REST` to everything from the position `ROEND + 1` to the end of `STMT` inclusively.
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5. Initialize the integer position variable `THENPOS` to -1.
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6. Pick the next keyword `KW` from this list in this particular order: `THEN LET = RETURN GOSUB INPUT PRINT GOTO END IF`. Go to step 11 when the list is exhausted.
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6. Pick the next keyword `KW` from this list in this particular order: `THEN IF LET = RETURN GOSUB INPUT PRINT GOTO END`. Go to step 11 when the list is exhausted.
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7. Set `THENPOS` to the first position of the currently iterated keyword `KW` inside `REST`. If not found, go to step 6.
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8. If `KW` is equal exactly to `=`, decrement `THENPOS` by 1.
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9. Copy the value of `THENPOS` to another integer variable, `RESTPOS`.
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