E $$-$$ F means ‘E is the mother of F’
E $$\div$$ F means ‘E is the father of F’
E $$+$$ F means ‘E is the sister of F’
E $$\times$$ F means ‘E is the brother of F’
If $$T \times U \div D \times C$$, then how is T related to C?
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