(i) ‘S × T means ‘S is the brother of T’.
(ii) ‘S ÷ T means T is the father of S.’
(iii) ‘S + T’ means ‘S is the sister of T’.
(iv) ‘S – T means ‘S is the mother of T’.
Which of the following statement(s) is/are superfluous to answer the above question?
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