Correct: m-f= k2, s-l= n2, t,-d= k2, d-r= n2, r-m= n2, f-s= n2, l-t= n2, Incorrect: m-f= n2, s-l= k2, t,-d= n2, d-r= k2, r-m= k2, f-s= k2, l-t= k2,

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