Given an array of side lengths, write a function to determine they can form a hexagon with three side-length pairs (as in, three pairs of equal sides needed). Return true if possible.

can_form_hexagon.rb

def can_form_hexagon(sides)
  return false unless sides.size == 6
  
  tally = sides.tally
  return false unless tally.size == 3 && tally.values.all?(2)
  
  a, b, c = tally.keys.sort
  [a, b, c].all? { |x| x < (a + b + c - x) }
end

puts can_form_hexagon([2, 3, 8, 8, 2, 3])
puts can_form_hexagon([1, 2, 3, 4, 5, 6])
puts can_form_hexagon([2, 2, 2, 2, 2, 2, 2])
puts can_form_hexagon([1, 1, 10, 10, 1, 1])
puts can_form_hexagon([3, 3, 4, 4, 5, 5])
puts can_form_hexagon([1, 2, 2, 3, 3, 4])