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4. 2021) states that, for every pair p, q ? O C , I(q) ? I(p) whenever q is obtained from p through a finite sequence of Hammond transfers. Meanwhile, q ? O C is obtained from p ? O C through a Hammond transfer if and only if p i ? q i = q j ? p j = q k ? q k = p l ? q l = 1 n for some quadruplet {i;Gravel;The Hammond principle
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