source: If a Contractor employee is unable to perform due to illness, resignation, or other factors beyond the Contractor's control, the Contractor shall make every reasonable effort to provide suitable substitute personnel.
target: If a Contractor employee is unable to perform due to illness the Contractor shall make every reasonable effort to provide suitable substitute personnel. This also goes for  resignation, or other factors beyond the Contractor's control.
references: If a Contractor employee is unable to perform due to illness the Contractor shall make every reasonable effort to provide suitable substitute personnel. This also goes for  resignation, or other factors beyond the Contractor's control.