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  _  __   _    _              __   __    _____   
 | |/ // | || | ||     ___    \ \\/ //  /  ___|| 
 | ' //  | || | ||    /   ||   \ ` //  | // __   
 | . \\  | \\_/ ||   | [] ||    | ||   | \\_\ || 
 |_|\_\\  \____//     \__ ||    |_||    \____//  
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Text this: Local stability of limit cycles for time-delay relay-feedback systems