This idea of twoness above is not as vague as it sounds, for we can agree
on a certain arbitrary model set containing what we call two things, our cow and rock if we wish, got by counting or other means, and
declare that any other set has two things if it can be put in one - to - one
correspondence (in modern terminology, bijective
correspondence) with our model set.
(7) An employer shall retain or arrange for some other person to retain all notices, certificates,
correspondence and other documents given to or produced by the employer that relate to an employee taking pregnancy leave, parental leave, family medical leave, organ donor leave, family caregiver leave, critical illness leave, child death leave, crime - related child disappearance leave, domestic or sexual violence leave, personal emergency leave, emergency leave during a
declared emergency or reservist leave for three years after the day
on which the leave expired.