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| Rx,y | Move relative;  moves the pen without drawing a line to the position x,y with respect to the current position. | 
| Xaxis,step,interval | Draw axis; draws the x or y axis for a
      graph.  The axis is specified by axis which must be 1 (x) or 0 (y). The
      distance between measurement marks on the axis is given by step (from -999 to 999) and the number of times that step must be repeated is given by interval (from 1 to 255). | 
 
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