So, the bugs that survive a filter cannot be eliminated by further application of that filter and also new bugs get introduced by correcting the bugs that were adjusted and also by newer development and so on.
ज्या बग्स एखाद्या फिल्टर मधून निसटल्या असतील, त्या बग्स पुन्हा त्याच फिल्टरच्या पुढील प्रयोगाद्वारे काढून टाकल्या जाऊ शकत नाहीत.