 TRIM                                                        Menu: (DRAW) EWIRE
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 Trims lines that are intersected by one or two other lines, to the point of
 intersection.

         1.   (NUM) trim by : 1-one line, 2-two lines <1>
      if reply is `1'
         2.   (IND) trimmer line
         3.   (Y/N) confirm choice
         4.   (POINT) remaining side
         5. * (IND) line to trim
         6. * (Y/N) confirm choice
      if reply is `2'
         2.   (Y/N) y-keep internal part, n-keep  external parts <y>
         2.   (IND) first trimmer line
         3.   (Y/N) confirm choice
         4.   (IND) second trimmer line
         5.   (Y/N) confirm choice
         6. * (IND) line to trim
         7. * (Y/N) confirm choice


 Description:
 This command trims lines to the intersection point of that line with another.
 There are two options: trim by one line and trim by two lines.
 When trimming by one line (default) you are prompted to define a trimming
 line. All lines that cross this line may be trimmed up to the intersection
 point. You are prompted to specify on which side of the trimming line the
 lines are to be saved. Then you are prompted to indicate the line to be
 trimmed. If the lines indicated do not intersect with the trimming line they
 will be extended to the trimming line as a result of this operation.
 When trimming by two lines, you are asked whether you want to keep the
 internal part or external parts. An internal trim will remove the section of
 line between the two trimmer lines, while an external trim will delete the
 whole line except for the section between them. Indicate the two trimming
 lines and confirm your choice. Then indicate the lines to be trimmed. The
 segment of these lines between the two trimming lines will be erased.
 During an external trim, if you indicate a line that lies between the trim
 lines but does not reach them, the line will be extended to the trimmer lines.
 NOTE: This command does not work on arcs.
