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The reader feedback form for the Phone system handout Homework 2 Homework 2 is due June 14. Solutions are here . Solutions are here . Problem 2.4 Problem 2.8 Problem 2.10 Problem 2.11 a Problem 2.21 Problem 2.22 a,b,c Problem 2.28 Problem 2.29 Homework 4 Homework 4 is due June 28. Solutions are here .