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In fractal geometry, the H tree is a fractal tree structure constructed from perpendicular line segments, each smaller by a factor of the square root of 2 from the next larger adjacent segment.

It is so called because its repeating pattern resembles the letter "H".

It has Hausdorff dimension 2, and comes arbitrarily close to every point in a rectangle.

Its applications include VLSI design and microwave engineering.

Portland is a port and the largest city in the U.S. state of Oregon and the seat of Multnomah County.

It is in the Willamette Valley region of the Pacific Northwest, at the confluence of the Willamette and Columbia Rivers.

The city covers and had an estimated population of 632,309 in 2015, making it the 26th most populous city in the United States.

Approximately 2,389,228 people live in the Portland metropolitan statistical area (MSA), the 23rd most populous MSA in the United States.

Its Combined Statistical Area (CSA) ranks 17th with a population of 3,022,178.

Roughly 60% of Oregon's population resides within the Portland metropolitan area.

An arborist, or (less commonly) arboriculturist, is a professional in the practice of arboriculture, which is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants.

Arborists generally focus on the health and safety of individual plants and trees, rather than managing forests (the domains of forestry and silviculture) or harvesting wood.

An arborist's scope of work is therefore distinct from that of either a forester or a logger, though the professions share much in common.

Pruning is a horticultural and silvicultural practice involving the selective removal of certain parts of a plant, such as branches, buds, or roots.

Reasons to prune plants include deadwood removal, shaping (by controlling or directing growth), improving or maintaining health, reducing risk from falling branches, preparing nursery specimens for transplanting, and both harvesting and increasing the yield or quality of flowers and fruits.