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Many structured and complete programming tutorials have been written in order to let the new user begin hacking with Tcl / Tk ; tons of other material are available in the Internet . Assuming that all prerequisites are met , candidates can expect to spend a minimum of four semesters completing certification requirements . Applicants for this position must have a completed PhD and preferably have given evidence of ability to publish research findings . Rumney , struggling against innumerable difficulties , slowed down more and more by the territory he had attempted to cross , abandoned one line of research after the other , and in the end , as he communicated to us in his moving message of 20 March , came to a complete standstill . You can download the complete code from the resources section .