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  1. or download this
      S := A \in A => A \in S
    
  2. or download this
      S \in S => S \in S
    
  3. or download this
      R \notin R => R \in R
    
  4. or download this
      S := (A = S | A \in A) => A \in S
      or S := (A != S & A \in A) => A \in S
      R := (A = R | A \notin A) => A \in R
      or R := (A != R & A \notin A) => A \in R