for(i=1;i<nLines1-1;i++)
{
for (j=i+1; j>nLines1; j++){
 if 
(((Coords1[i][0]==Coords1[j][0])&&(Coords1[i][1]==Coords1[j][1]))||
((Coords1[i][0]==Coords1[j][2])&&(Coords1[i][1]==Coords1[j][3])){
                        temp[k][0]=Coords1[i][0];
			temp[k][1]=Coords1[i][1];
                        k++
}
if
((Coords1[i][2]==Coords1[j][0])&&(Coords1[i][3]==Coords1[j][1]))||
((Coords1[i][2]==Coords1[j][2])&&(Coords1[i][3]==Coords1[j][3])))
 {
                        temp[k][0]=Coords1[i][2];
			temp[k][1]=Coords1[i][3];
                        k++
}
}
}