This function loads the `S.2` dataset into R.
     
    
    Usage
    load_S_2(filepath = NULL)
 
    
    Arguments
- filepath
- (optional) Path to the downloaded `.Rdata` file.
If `NULL`, the file will be downloaded automatically. 
 
    
    Value
    The loaded dataset.
     
    
    Examples
    if (FALSE) { # \dontrun{
S.2 <- load_S_2()
} # }