Xxx-Off or Furloughs. Should a lay-off or furlough be necessary they shall be made in the inverse order of seniority within the employee’s classification. Employees affected by lay-off or furlough who have the requisite seniority will have the right to bump back to positions or classifications previously held. Employees affected by lay-offs or furlough will be recalled to fill any vacancies within their classification within two (2) years of the date of lay-off.