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for height and size of structure or size of yards and open spaces; establishment or expansion of a use otherwise prohibited shall not be allowed by variance nor shall a variance be granted because of the presence of nonconformities in the zoning district or uses in an adjoining zoning district.
WALL:	Any structure or device forming a physical barrier, which is so con-
structed that fifty (50) percent or more of the vertical surface is closed to prevent the passage of light, air, and vision through said surface in a horizontal plane. This shall include concrete, concrete block, wood, or other materials that are solids and are so assembled as to form a solid barrier.
WAY:	A street, thoroughfare, or easement permanently established for passage
of persons or vehicles.
YARD:	A	space	on the same lot with the principal building, open, unoccupied,
and unobstructed by buildings or structures from ground to sky except where encroachments and accessory buildings are expressly permitted.
YARD, FRONT:	.An open, unoccupied space on the same lot with a principal
building, extending the full width of the lot and situated between the street line and the front line of the building projected to side lines of the lot.
YARD, REAR:	An open, unoccupied, except by a possible accessory building,
space on the same lot with a principal building, extending the full width of the lot and situated between the rear line of the building projected to side lines of the lot.
YARD, SIDE:	An open, unoccupied space on the sarr.e lot with a principal
building, situated between the building and the side line of the lot and extending from the rear line of the front yard to the front line of the rear yard.
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