" ON segment_id=current_segments.id,"+
" current_nodes AS cn1,current_nodes AS cn2"+
" WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"cn1.")+
" ON segment_id=current_segments.id,"+
" current_nodes AS cn1,current_nodes AS cn2"+
" WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"cn1.")+