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Exercise 1.5
Every second element of a list **

Write a function, every-second-element, that returns every second element of a list. As examples

  (every-second-element '(a b c)) => (a c)
  (every-second-element '(a b c d)) => (a c)

It is often worthwhile to go for a more general solution than actually needed. Therefore, program (every-nth-element n lst) where n >= 1 and lst is a proper list.

Can you define every-second-element in terms of every-nth-element?