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The <code>IF</code> is likewise notable. It places an increment, <code>(x=x+1)</code>, in front of the test, a feature not normally available in BASIC. In this case the IF is told to call <code>SKIP -2</code> if true, which will move back two lines and can be used in place of a <code>GOTO</code>.
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==References==
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* Thomas DeFanti, Jay Fenton and Nola Donato, [http://dl.acm.org/citation.cfm?id=807366 "BASIC Zgrass—a sophisticated graphics language for the Bally Home Library Computer"], Proceedings of the 5th annual conference on Computer graphics and interactive techniques, ''ACM SIGGRAPH Computer Graphics'', Volume 12 Issue 3 (August 1978), pp. 33–37
* {{cite magazine |first=Thomas |last=DeFanti
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*[http://www.ballyalley.com/documentation/zgrass/zgrass.html Bally Alley ZGRASS Documentation] - includes PDF versions of scans of the UV-1 Zgrass manual
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