positive test of <=                                                             
passed                                                                          
positive test of =<                                                             
passed                                                                          
positive test of >=                                                             
passed                                                                          
positive test of =>                                                             
passed                                                                          
positive test of <>                                                             
passed                                                                          
positive test of ><                                                             
passed                                                                          
