Classify x data as
if x>=0 then y=1
if x<0 then y=0
x = [ -2 -1 0 1 2]
y = [ 0 0 1 1 1]
Additional test cases have been added.
Remove all the words that end with "ain"
Back to basics 25 - Valid variable names
Number of 1s in a binary string
average for three points
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