anchor.diff:  
   The number of values in a READ statement do not have to match the number of values in DATA statements.
   The values defined in DATA statements are stored in a single list of use by all READ statements.
  -You may READ in pairs and define ten values per DATA statement. You may READ ten items from DATA statements that contain one value each.
  +You may READ in pairs and define ten values per DATA statement.
  +You may READ ten items from DATA statements that contain one value each.
   
   READing more values than are specified by DATA statements, in total, will cause an error.
   
  -BASIC keeps an internal pointer to the next data item. This pointer can be reset with the RESTORE statement.
  +BASIC keeps an internal pointer to the next data item.
  +This pointer can be reset with the RESTORE statement.
   
   Reading from files
   ^^^^^^^^^^^^^^^^^^
  
positive.code: 
  	20 FILES "test.txt"
  
  File names must be enclosed in double-quotres.
  Files must exist at the start of the program, even when the file will be written.
  It is not possible for BASIC to create a file.
  
  
negative.code: Variables
  ---------
  
  Variables store numeric and text values.
  Numeric variables handle integer and floating point values automatically.
  
  Variable names consist of a single letter and an optional digit and an optional subscript.
  Subscripts are enclosed in parentheses or square brackets.
  