order tree
A horizontal rail with vertical supports to which a horse can be hitched, or tied up to.
in front of
plural of ladder
(topology) A set that is the union of subsets (called segments), each of which is totally ordered, such that the segments fit together a certain way.
位相幾何学では、各線分が全順序を持ち、線分がある特定の方法でつながっているような線分の合併で表される集合を、順序づけられた線分からなる木（順序木）と呼びます。
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DiQt
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