update to pset#4

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cceballos-stanford wants to merge 3 commits intopsych251:masterfrom

cceballos-stanford:master

Commits on Nov 11, 2019

created pset4
cceballos-stanford
committed

Commits on Nov 12, 2019

pset4 completed
cceballos-stanford
committed

Commits on Nov 30, 2019

pset 4 updated
cceballos-stanford
committed