help I need find vertex displaced or not overlappping

[DAVID_OJEDA]

Good evening CAD Gurus. I request your valuable help with a lisp routine, I have hundreds of files with adjacent closed polylines and all of them must coincide in the vertices, however, this is not always the case, since there are vertices that are not overlapped and are displaced by minimum distances, or there are vertices in the midpoints of another polyline, is there any way to locate the failure points with a lisp routine and enclose in a circle the separated vertices or located in the midpoint of the adjacent polyline? 

 

thank you I appreciate your attention and help

EXAMPLE.dwg

[chulse]

Seems like this may be a better job for GIS software using topology rules to enforce shared boundaries.