d = {'a':1, 'b':0, 'c':1, 'd':0}
for key, val in d.items():
    del(d[key])

d = {'a':1, 'b':0, 'c':1, 'd':0}
for key in d.keys():
    del(d[key])

d = {'a':1, 'b':0, 'c':1, 'd':0}
keys = list(d.keys())
for key in keys:
    del(d[key])

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