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pre-order preorder 前序 preorder 前序 Preorder \Pre*or"der\, v. t. To order to arrange beforehand; to foreordain. --Sir W. Hamilton. [1913 Webster] 1.
2. (x R x) and {transitive} (x R y R z => x R z). If it is also {antisymmetric} (x R y R x => x = y) then it is a {partial ordering}. (2001-10-01)
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