condition                                                                   
                                                                                                                      
                                                                                                                   yes
                                                                                                                      
                                                                                                                      
                                                                                                                      
                              return false                                                                            
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                    doSomething1                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                    doSomething2                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                               ...