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can i read text file into graphviz

i want to read a text file in graphviz, in that text file i have name of the employee and time of arrival to office,name and enter time are separated by @ symbol in text file now i want to read the text file and draw graph who came to office first second etc ..... for that i need to read the text file and i want only the name in variable ..can we do this ??>????

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