pulling a4 from cs147 last year
pulling a4 from cs147 last year


Former-commit-id: 1e18cd8fdc8ac7b7748dbda495724a5a0e494229
Former-commit-id: 824f4f0f2d6ea56dc9c24eb739824738952a99c6
Former-commit-id: 84e35aa1521e20c01145625b1a6a3d5668127d07
StanfordHCI/cs247,StanfordHCI/cs247,StanfordHCI/cs247