You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: driving_licence.rb
    path of file: ./repos/faker/lib/faker/default
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Faker
  class DrivingLicence < Base
    GB_PADDING = '9999'
    NI_CHANCE = 0.03 # NI Pop is about 3% of total UK population

    class << self
      ##
      # Produces a random British driving licence number.
      #
      # @param last_n
    
      def gb_licence_year(dob, gender)
        generate(:string) do |g|
          g.computed do
            (dob.year / 10) % 10
          end
          g.computed do
            gender_marker = gender == :female ? 50 : 0
            format('%02d', (dob.month + gender_marker))
          end
          g.computed do
            format('%02d', dob.day)
          end
          g.computed do
            dob.year % 10
          end
        end
      end

      def gb_licence_checksum
        generate(:string) do |g|
          g.int
          g.letter(ranges: ['A'..'Z'], length: 2)
        end
      end
    end