Pb1
100, 100; 250, 100; 400, 100; 400, 250; 400, 400; 250, 400; 100, 400; 100, 250;
0, 1; 1, 2; 2, 3; 3, 4; 4, 5; 5, 6; 6, 7; 7, 0; 7, 1; 3, 5;
Pb2
300, 100; 500, 100; 600, 300; 500, 500; 300, 500; 200, 300; 
0, 1; 1, 2; 2, 3; 3, 4; 4, 5; 5, 0; 
Pb3
100, 100; 100, 300; 300, 300; 300, 100; 500, 100; 500, 300; 700, 300; 700, 100;
0, 1; 1, 2; 2, 3; 3, 4; 4, 5; 5, 6; 6, 7; 
Pb4
100, 100; 300, 100; 450, 200; 300, 300; 100, 300;
0, 1; 1, 2; 2, 3; 3, 4; 4, 0; 1, 3;
Pb4
200, 100; 500, 100; 500, 300; 200, 300; 600, 200; 400, 200; 300, 200; 100, 200;
0, 1; 1, 2; 2, 3; 3, 7; 7, 0; 6, 0; 6, 7; 6, 3; 1, 4; 1, 5; 2, 4; 2, 5;