definition of Wikipedia
The National Topographic System or NTS (French: Système national de référence cartographique) is the topographic system used by Canada for providing general purpose maps of the country. NTS maps are available in 1/50,000 and 1/250,000 scales. The maps provide details on landforms and terrain, lakes and rivers, forested areas, administrative zones, populated areas, roads and railways, as well as other man-made features. These maps are currently used by all levels of government and industry for forest fire and flood control (as well as other environmental issues), depiction of crop areas, right-of-way, real estate planning, development of natural resources and highway planning.
A map sheet is defined by a string containing:
A map sheet is further divided in blocks, units and quarter units.
A series generally has a width of 8 degrees of longitude and 4 degrees of latitude from north to south.
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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
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