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AddSeg is a Symbol Definition Command. It is used to add a line segment to a symbol.
| AddSeg <start-x> <start-y> <end-x> <end-y> | 
| start-x | Integer. Symbol x co-ordinate of start of segment | 
| start-y | Integer. Symbol y co-ordinate of start of segment | 
| end-x | Integer. Symbol x co-ordinate of end of segment | 
| end-y | Integer. Symbol y co-ordinate of end of segment | 
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