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links: https://www.edx.org/course/berkeley/cs169-1x/software-service/1136 https://www.edx.org/course/berkeley/cs169-1x/software-servic... https://www.edx.org/course/berkeley/cs169-2x/software-service/1275 https://www.edx.org/course/berkeley/cs169-2x/software-servic...