Draw slop lines that express inclined surface
 
    File name : SLOPL.LSP

  Select two lines(p1,p2), and Enter number of division then Program draws lines between two lines. 
  Even though the length of the two lines is different It is possible. 
 
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  Select first line: {p1}       [Select first line]
  Select second line: {p2}      [Select second line]
  Divide number?: 5    [Enter number of division between two lines]