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2. Free shipping - Wikipedia

   en.wikipedia.org/wiki/Free_shipping

   Internet vendors benefit from a simplified sales model as compared to traditional brick-and-mortar stores. By storing goods remotely at a warehouse location and shipping goods directly to a consumer, significant transportation needs are eliminated both on the part of the vendor (shipping goods to stores) and by the consumer (traveling to stores).

3. Tree (graph theory) - Wikipedia

   en.wikipedia.org/wiki/Tree_(graph_theory)

   In graph theory, a tree is an undirected graph in which any two vertices are connected by exactly one path, or equivalently a connected acyclic undirected graph. [1] A forest is an undirected graph in which any two vertices are connected by at most one path, or equivalently an acyclic undirected graph, or equivalently a disjoint union of trees.

4. Artificial Christmas tree - Wikipedia

   en.wikipedia.org/wiki/Artificial_Christmas_tree

   An artificial fiber optic Christmas tree. An artificial or fake Christmas tree is an artificial pine or fir tree manufactured for the specific purpose of use as a Christmas tree. The earliest artificial Christmas trees were wooden, tree-shaped pyramids or feather trees, both developed by Germans.

5. Nuytsia - Wikipedia

   en.wikipedia.org/wiki/Nuytsia

   Nuytsia floribunda is a hemiparasitic tree found in Western Australia. The species is known locally as moodjar and, more recently, the Christmas tree or Western Australian Christmas tree. The display of intensely bright flowers during the austral summer coincides with the Christmas season.

6. Christmas tree (oil well) - Wikipedia

   en.wikipedia.org/wiki/Christmas_tree_(oil_well)

   Oil well Christmas tree. In petroleum and natural gas extraction, a Christmas tree, or tree, is an assembly of valves, casing spools, and fittings used to regulate the flow of pipes in an oil well, gas well, water injection well, water disposal well, gas injection well, condensate well, and other types of well.

7. Christmas tree production - Wikipedia

   en.wikipedia.org/wiki/Christmas_tree_production

   Christmas tree production occurs worldwide on Christmas tree farms, in artificial tree factories and from native strands of pine and fir trees. Christmas trees , pine and fir trees purposely grown for use as a Christmas tree, are grown on plantations in many western nations, including Australia, the United Kingdom and the United States.