Test string is:
I am only human after all. I am so tired. I am so happy. I am tired. I am so so so so so happy. I do love and love and love you all. I love and hate. Apple or banana. Apple and banana.

Let's generate something:
Chain No. 1
I am so so so happy. I am so so happy. I do love and hate. Apple or banana. Apple and love and banana. Apple and love and love you all. I do love and hate. Apple and banana. Apple and banana. Apple or banana. Apple and hate. Apple or banana. Apple and love and banana. Apple or banana. Apple or banana. Apple and hate. Apple or banana. Apple or banana. Apple or banana. Apple or banana. Apple or banana. Apple or banana. Apple or banana. Apple or banana. Apple and banana. Apple and love and love and banana. Apple 

Chain No. 2
I am only human after all. I do love and love and love and love you all. I do love you all. I do love and love and love you all. I am only human after all. I am so tired. I am only human after all. I love and banana. Apple and love and hate. Apple and love you all. I am so happy. I am so happy. I am so so so happy. I love and love and hate. Apple and hate. Apple and hate. Apple or banana. Apple and banana. Apple and love and banana. Apple and 

Chain No. 3
I do love you all. I am so so so so so so so so so happy. I am only human after all. I am so so so so so so so so happy. I am only human after all. I am tired. I do love and love and banana. Apple and love you all. I am so so so tired. I am so so so happy. I do love you all. I am so so so tired. I am so happy. I am so so so happy. I love and love and love and love and hate. Apple and