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Hi dear friend. This is a system telling knock knock jokes. A typical knock knock joke is like this: Jack says: Knock Knock! Tom says: Who's there? Jack says: Police. Tom says: Police who? Jack says: Police let us in; it's cold out here! So, would you like to have a try? } [continue yes sure (of course) try] {} ]]]> I did't hear anything. Please say yes to play and say no to quit. I did't recognize that. Please try again.

I'm sorry to hear that. I'll improve myself in the future. See you later!

} (who's there){} [negtive quit] {} ] ]]> knock knock! I said knock knock, it's your turn now. You can say who' there. I am sorry, I didn't hear anything. I said knock knock.

} (keith who){} (tank who){} [negtive quit] {} ] ]]> I am sorry, I didn't hear anything. I said . I can't recognize you. Say who please. Wrong answer, say again please!

} [more yes] {} (more jokes) {} ;Parentheses require all of the enclosed terms to be matched ] ]]> Interesting, isn't it? I have more jokes to tell. Do you wanna try that again? Sorry I can't hear. Say yes to hear more jokes, say no to quit. Sorry, I can't understand. Say yes to hear more jokes, say no to quit.