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  2. Birch - Wikipedia

    en.wikipedia.org/wiki/Birch

    Birch plywood is made from laminations of birch veneer. It is light but strong, and has many other good properties. It is among the strongest and dimensionally most stable plywoods, although it is unsuitable for exterior use. Birch plywood is used to make longboards , giving it a strong yet flexible ride

  3. Ecclesiastical polity - Wikipedia

    en.wikipedia.org/wiki/Ecclesiastical_polity

    In the Catholic Church, bishops have authority over the diocese, which is both sacramental and political; as well as performing ordinations, confirmations, and consecrations, the bishop supervises the clergy of the diocese and represents the diocese both secularly and in the hierarchy of church governance.

  4. Four stages of competence - Wikipedia

    en.wikipedia.org/wiki/Four_stages_of_competence

    The four stages of competence arranged as a pyramid. In psychology, the four stages of competence, or the "conscious competence" learning model, relates to the psychological states involved in the process of progressing from incompetence to competence in a skill.

  5. Hierarchy - Wikipedia

    en.wikipedia.org/wiki/Hierarchy

    Hierarchy is an important concept in a wide variety of fields, such as architecture, philosophy, design, mathematics, computer science, organizational theory, systems theory, systematic biology, and the social sciences (especially political science). A hierarchy can link entities either directly or indirectly, and either vertically or diagonally.

  6. Hierarchical organization - Wikipedia

    en.wikipedia.org/wiki/Hierarchical_organization

    A hierarchy is typically visualized as a pyramid, where the height of the ranking or person depicts their power status and the width of that level represents how many people or business divisions are at that level relative to the whole—the highest-ranking people are at the apex, and there are very few of them, and in many cases only one; the base may include thousands of people who have no ...

  7. Social stratification - Wikipedia

    en.wikipedia.org/wiki/Social_stratification

    It is a hierarchy within groups that ascribe them to different levels of privileges. [1] As such, stratification is the relative social position of persons within a social group, category, geographic region, or social unit .

  8. Betulaceae - Wikipedia

    en.wikipedia.org/wiki/Betulaceae

    Betulaceae, the birch family, includes six genera of deciduous nut-bearing trees and shrubs, including the birches, alders, hazels, ...

  9. Hierarchical clustering - Wikipedia

    en.wikipedia.org/wiki/Hierarchical_clustering

    The standard algorithm for hierarchical agglomerative clustering (HAC) has a time complexity of () and requires () memory, which makes it too slow for even medium data sets. . However, for some special cases, optimal efficient agglomerative methods (of complexity ()) are known: SLINK [2] for single-linkage and CLINK [3] for complete-linkage clusteri