68-Erase Inside (EICP)
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The Erase Inside (EICP) command is used to erase the objects in side closed pline.
Step:
1-Load the "68-Erase Inside (EICP).lsp" into your AutoCAD
2-Type "EICP" in the command line.
3-Click over the closed pline.
4-Result inside objects removed.

69-Break Line (BREAKAT)
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The Break Line (BREAKAT) command is used to break line pline at any point.
Step:
1-Load the "69-Break Line (BREAKAT).lsp" into your AutoCAD
2-Type "BREAKAT" in the command line.
3-Click over the point of line pline.

70-Block Area (BAREA)
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The Block Area (BAREA) command is used to find area for any closed pline in the block.
Step:
1-Load the "70-Block Area (BAREA).lsp" into your AutoCAD
2-Type "BAREA" in the command line.
3-Click over the block closed pline.

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Learning AutoLISP & Visual LISP
*******************************
00. Introduction
01. LISP Formatting
02. LISP Functionality
03. Visual LISP Introduction
04. Working with Strings
05. Working with Lists
06. Getting Data From Users
07. Loops
08. Selection Sets
09. Working with Geometry
10. Creating and Editing Graphic Entities
11. Creating and Editing Non-Graphic Entities
12. Storing Data
13. Loading LISPs and Error Trapping
14. Conclusion

A Guide to Programming the Lisp Machine (2nd ed.)