FORMATS = {
    'vertical_4'   => %w[vertical small small small small],
    'horizontal_4' => %w[horizontal small small small small],
    'horizontal_2' => %w[large small small],
    'mixed_3'      => %w[vertical horizontal small small],
    'huge'         => %w[horizontal small small horizontal small small small]
  }

MAX_ELEMENTS   = FORMATS.map {|_,v| v}.max.size

FORMATS.map {|_,v| v}.map(&:size).max