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  2. TruGreen - Wikipedia

    en.wikipedia.org/wiki/TruGreen

    TruGreen, originally known as ChemLawn and later as TruGreen ChemLawn, is the largest lawn treatment company in the United States. [ 1 ] [ 2 ] [ 3 ] The company was founded in 1969 and provides lawn care and tree and shrub care treatments on a subscription basis (except in New York where it is by contract basis). [ 4 ]

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  4. Lists of problems - Wikipedia

    en.wikipedia.org/wiki/Lists_of_problems

    The following articles contain lists of problems: List of philosophical problems; List of undecidable problems; Lists of unsolved problems; List of NP-complete problems; List of PSPACE-complete problems

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    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

  6. Problem statement - Wikipedia

    en.wikipedia.org/wiki/Problem_statement

    A problem statement is a description of an issue to be addressed, or a condition to be improved upon. It identifies the gap between the current problem and goal. The first condition of solving a problem is understanding the problem, which can be done by way of a problem statement. [1]

  7. List update problem - Wikipedia

    en.wikipedia.org/wiki/List_update_problem

    The List Update or the List Access problem is a simple model used in the study of competitive analysis of online algorithms.Given a set of items in a list where the cost of accessing an item is proportional to its distance from the head of the list, e.g. a linked List, and a request sequence of accesses, the problem is to come up with a strategy of reordering the list so that the total cost of ...

  8. Three utilities problem - Wikipedia

    en.wikipedia.org/wiki/Three_utilities_problem

    When posing it in the early 20th century, Henry Dudeney wrote that it was already an old problem. It is an impossible puzzle: it is not possible to connect all nine lines without crossing. Versions of the problem on nonplanar surfaces such as a torus or Möbius strip, or that allow connections to pass through other houses or utilities, can be ...

  9. Environmental Health

    images.huffingtonpost.com/2009-01-27-1476069x82.pdf

    Background Chlorine and caustic soda are produced at chlor-alkali plants using mercury cells or the increasingly popular membrane technology that is mercury free and more energy-

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