Rule 3 : A singular pronoun should be used when two singular nouns are joined by either or / neither nor
Ex- Either Ram or Rakesh should do his duty.

Rule 4 : The verbs such as "Hurt / Cheat / Prostrate / Introduce / Present / Absent / Satisfy / Prepare / Enjoy / Avail of" are followed by either an object or a reflExive pronoun. (Myself / Ourselves / Yourself / Yourselves) (Himself / Herself / Itself / Themselves)
Ex - I introduced myself to the Principal.