daktyr_software_mansion

def check_if_exists ( array_a = [], array_b = [])
  array_a.select { |value| array_b.count(value) < 2 }
end

A=[2,3,9,2,5,1,3,7]
B=[2,1,3,4,3,6,6,1,7]

puts check_if_exists(A, B).inspect