offset lisp from scratch

im new to the lisp world and would like a offset lisp routine i can understand. i have two lines and i want to offset those two lines in oposite directions by entering the total distance between the two. so, i have two parellel lines "4" apart. i want two more lines parellel but "6" apart. "6" would be the total distance the user desires. "4" is just an example.
i would be greatful for anyone who has ideas or any sort of help. again, im new to this. so simple instruction would be nice. thanks again
Oak3s

 

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Next, it would be nice if you wrote part of the code as an effort to learn,
just to get started, but since you're new you'll have to be a bit more
specific on what you'd like to use it for.

2 parallel lines, wall? Structural, veneer, pipe, etc.?

Select line
Return-start-end-angle-point-picked-layer
Plot-point-90deg
Find-line-on-filtered-layer-and-angle
Plot-point-offset-from-1st-line
Plot-point-offset-from-2nd-line
construct-entmake-vla-make-on-the-fly
loop-repeat-while-continue?-it's-up-to-you

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understand. i have two lines and i want to offset those two lines in oposite
directions by entering the total distance between the two. so, i have two
parellel lines "4" apart. i want two more lines parellel but "6" apart. "6"
would be the total distance the user desires. "4" is just an example.

im new to this. so simple instruction would be nice. thanks again