*Vertices       6
       1 "v1"                                     0.4872    0.4764    0.5000 
       2 "v2"                                     0.6715    0.0690    0.5000 
       3 "v3"                                     0.7774    0.6969    0.5000 
       4 "v4"                                     0.1253    0.6515    0.5000
       5 "v5"                                     0.0645    0.3648    0.5000
       6 "v6"                                     0.4805    0.8512    0.5000
*Arcs :1 "First relation"
       1        2 
       1        3 
       1        4 
       3        6 
*Arcs :2 "Second relation"
       1        2  
       1        4  
       1        5  
       4        6  
*Arcs :3 "Third relation"
       1        2  
       1        3  
       1        5  
       1        6