Set operations in list

# Set operations are beatiful:

a = [1,2,3,4,5]
b = [2,4,6,8,10]

(a & b)
# => [2,4]

# When comparing lists, which is more or less what administration of
# pension schemes is all about, this is very, very nice.

# I very often use stuff like
(a – (a&b))

# => [1,3,5]

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