Create incrementors

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In order to use in various map-expressions, we need a couple of functions that - for simplicity - need to increment a number:

examples/closures/create_incrementors.py

def f3(x):
    return x + 3

def f7(x):
    return x + 7

def f23(x):
    return x + 23

print(f3(2))
print(f7(3))
print(f3(4))
print(f7(10))
print(f23(19))

5
10
7
17
42