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PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [3] [4] It runs on Linux, Windows and macOS. [5] It comes in three versions: PDFtk Server (open-source command-line tool), PDFtk Free and PDFtk Pro (proprietary paid). [2] It is able to concatenate, shuffle, split and rotate PDF files.
LBLD consists of dyscalculia which comprises the reading of numbers sequentially, learning the time table, and telling time; [6] dyslexia; and difficulties associated with written language such as trouble learning new vocabulary, letters and alphabets.
Dyscalculia is thought to be present in 3–6% of the general population, but estimates by country and sample vary somewhat. [69] Many studies have found prevalence rates by gender to be equivalent. [ 36 ] [ 70 ] Those that find gender difference in prevalence rates often find dyscalculia higher in females, but some few studies have found ...
This isn't dyscalculia, this describes dyslexia: dyslexia doesn't "become" dyscalculia because the symbols being misinterpreted represent numbers rather than sounds - problems with alphanumeric recognition are dyslexia. Dyscalculia is an inability to compute numbers, pure and simple: for the dyscalculic, 4+7 is as much mental arithmetic as 346÷13.
Learning disability, learning disorder, or learning difficulty (British English) is a condition in the brain that causes difficulties comprehending or processing information and can be caused by several different factors.
Dysorthography is a disorder of spelling which accompanies dyslexia by a direct consequence of the phonological disorder. [1] [2] In the American classification from the American Psychiatric Association (APA) and the classification from the World Health Organization (WHO), it is a subtype of specific learning disorder with impairment in written expression.
Acalculia is associated with lesions of the parietal lobe (especially the angular gyrus) and the frontal lobe and can be an early sign of dementia.Acalculia is sometimes observed as a "pure" deficit, but is commonly observed as one of a constellation of symptoms, including agraphia, finger agnosia and right-left confusion, after damage to the left angular gyrus, known as Gerstmann syndrome.
Skuas are medium to large birds, typically with grey or brown plumage, often with white markings on the wings. [6] The skuas range in size from the long-tailed skua, Stercorarius longicauda, at 310 grams (0.68 pounds), to the brown skua, Stercorarius antarcticus, at 1.63 kg (3.6 lb). On average, a skua is about 56 cm (22 in) long, and 121 cm ...