Question: what does De Zoeker, Zaandam and Flax have in common?

full_context: Document 1: WindSeeker: WindSeeker (known as SteelHawk at Worlds of Fun) is a 301 ft swing ride at several Cedar Fair parks. The rides are Wind Seeker models manufactured by Mondial. They opened for the 2011 season at Canada's Wonderland in Ontario, Cedar Point and Kings Island in Ohio, and Knott's Berry Farm in California. Carowinds in North Carolina and Kings Dominion in Virginia opened their WindSeekers in 2012. The first four each cost US$5,000,000, and the next two each cost $6,500,000. Cedar Fair relocated the Knott's Berry Farm WindSeeker to Worlds of Fun in 2014, where it is known as SteelHawk.
Document 2: Old Mill (ride): An old mill is a type of amusement park ride with unaccompanied boats floated on guideways through dark tunnels. These themed dark rides originated in the late 19th century and are known by a variety of names, including tunnel of love and river cave. While generally considered a gentle ride, a variation that ends with a climactic splashdown, similar to the modern-day log flume, is known as a mill chute.
Document 3: Linum marginale: Linum marginale, known by the common name of 'native flax' or 'Australian flax', is a short lived perennial flowering herb, native to Australia. A slender, wispy, upright plant, growing to around 1 metre high, Native Flax is often overlooked when not in flower. It should not be confused with species of Wahlenbergia, which occurs in the same area and can appear similarly. Like most species of Linum, Linum marginale can be used to produce useful fibre, but is not grown on a commercial level for this purpose.
Document 4: Linum grandiflorum: Linum grandiflorum (syn. L. coccineum) is a species of flax known by several common names, including flowering flax, red flax, scarlet flax, and crimson flax. It is native to Algeria, but it is known elsewhere in Northern Africa, Southern Europe and in several locations in North America as an introduced species. It is an annual herb producing an erect, branching stem lined with waxy, lance-shaped leaves 1 to 2 centimeters long. The inflorescence bears flowers on pedicels several centimeters long. The flower has 5 red petals each up to 3 centimeters long and stamens tipped with anthers bearing light blue pollen. It can on occasion be found as a casual well outside its normal established range; records from the British Isles, for example, are reasonably frequent (as per the latest BSBI atlas) but, grown as an annual, it rarely persists for more than one season.
Document 5: Boyd's Windmill: Boyd's Windmill, also known as Boyd's Wind Grist Mill, is a historic smock mill at Paradise Valley Park on Prospect Avenue in Middletown, Rhode Island. John Peterson built the windmill on Old Mill Lane in Portsmouth, Rhode Island in 1810, and William Boyd purchased it in 1815. It originally had four common sails, but four more were added by the family. The mill is a timber-frame structure, octagonal in shape, and about 30 ft tall, with a rotating cap powered by eight vanes with canvas sheets. The grindstones in the middle of the mill are Fall River granite; the upper one, which is connected to the power mechanisms, rotates six times for each turn of the mill's main shaft. In 1916 Benjamin Boyd removed the original vanes and powered the mill using a gasoline engine. It is one of only two windmills (out of what was estimated to be more than thirty) to survive on Aquidneck Island.
Document 6: Assumburg: The Assumburg, also known as Het Huis Assenburg (English: "The House Assenburg"), is a windmill located on the Veerweg 1 in Nieuw-Vossemeer, Steenbergen, in the province of North Brabant, Netherlands. Build in 1780 in The Zaan district, the windmill functioned as oil mill, until it was moved to its current location in 1897, when it became a gristmill. The mill was built as a tower mill with a bottom support of 5.20 meters high, and its sails have a span of 22.20 meters. The mill is a national monument (nr 30611) since 15 May 1973.
Document 7: Lavandula: Lavandula (common name lavender) is a genus of 47 known species of flowering plants in the mint family, Lamiaceae. It is native to the Old World and is found from Cape Verde and the Canary Islands, Europe across to northern and eastern Africa, the Mediterranean, southwest Asia to southeast India. Many members of the genus are cultivated extensively in temperate climates as ornamental plants for garden and landscape use, for use as culinary herbs, and also commercially for the extraction of essential oils. The most widely cultivated species, "Lavandula angustifolia", is often referred to as lavender, and there is a color named for the shade of the flowers of this species.
Document 8: List of windmills in London: A list of existing and former windmills whose sites fall within Greater London, England. When built, these mills were within the counties of Kent, Surrey, Middlesex, Hertfordshire or Essex. Of those windmills known to have existed, nine remain and are preserved; as are the tide mills at Three Mills, West Ham.
Document 9: Hesperolinon: Hesperolinon is a genus in the family Linaceae, whose common genus names are dwarf-flax or western flax, in reference to their distribution along the west coast of North America. There are 13 known species within this genus of wildflowers, most of which are limited to serpentine soil habitats within California, United States. These annual plants are thought to be mostly self-pollinating.
Document 10: Hesperolinon adenophyllum: Hesperolinon adenophyllum is a rare species of flowering plant in the flax family known by the common names glandular dwarf flax and glandular western flax. It is endemic to California, where most known occurrences have been recorded in Lake and Mendocino Counties. It is generally found in chaparral ecosystems on serpentine soils. This is an annual herb growing erect to heights between 10 and 50 centimeters. Its narrow, lance-shaped leaves are lined with rows of teeth with large knobby glandular points. The flower has small sepals speckled with glandular hairs and five thin yellow petals. The stamens protrude from the face of the flower and hold large yellow anthers.
Document 11: Flax in New Zealand: New Zealand flax describes the common New Zealand perennial plants "Phormium tenax" and "Phormium colensoi", known by the Māori names "harakeke" and "wharariki" respectively. Although given the common name 'flax' they are quite distinct from the Northern Hemisphere plant known as flax ("Linum usitatissimum")
Document 12: Scutching: Scutching is a step in the processing of cotton or the dressing of flax in preparation for spinning. The scutching process separates the impurities from the raw material, such as the seeds from raw cotton or the straw and woody stem from flax fibers. Scutching can be done by hand or by a machine known as a scutcher. Hand scutching of flax is done with a wooden scutching knife and a small iron scraper. The end products of scutching flax are the long flax fibers, short coarser fibers called tow and waste woody matter called shive.
Document 13: Expeller pressing: Expeller pressing (also called oil pressing) is a mechanical method for extracting oil from raw materials trademarked by Anderson International Corp. Mr. Valerius D. Anderson founded the V. D. Anderson Company in Cleveland, Ohio in 1888. In 1900, Mr. V. D. Anderson created the first successful continuously operated Expeller press. The raw materials are squeezed under high pressure in a single step. When used for the extraction of food oils, typical raw materials are nuts, seeds and algae, which are supplied to the press in a continuous feed. As the raw material is pressed, friction causes it to heat up; in the case of harder nuts (which require higher pressures) the material can exceed temperatures of 120 F .
Document 14: De Zoeker, Zaandam: De Zoeker ("The Seeker") is the name of an oil windmill, located in the Zaanse Schans, Zaanstad. Its purpose is to press seeds such as linseed and rapeseed into vegetable oil. It is the only oil mill still in operation, and is one of five remaining oil mills in the area.
Document 15: Flax: Flax (also known as common flax or linseed), "Linum usitatissimum", is a member of the genus "Linum" in the family Linaceae. It is a food and fiber crop cultivated in cooler regions of the world. The textiles made from flax are known in the Western countries as linen, and traditionally used for bed sheets, underclothes, and table linen. The oil is known as linseed oil. In addition to referring to the plant itself, the word "flax" may refer to the unspun fibers of the flax plant. The plant species is known only as a cultivated plant, and appears to have been domesticated just once from the wild species "Linum bienne", called pale flax.
ground_truth: linseed