graphsize 450,450
clg
color blue
poly {10,10, 210,10 ,210,210 ,10,10}
color red 
poly {10,10, 10,210, 210,210, 10,10}
color blue 
poly {410,10, 410,210, 210,210, 410,10}
color red
poly {410,10, 210,10, 210,210, 410,10}
color blue
poly {410,410, 210,410, 210,210, 410,410}
color red
poly {410,410, 410,210, 210,210, 410,410}
color blue
poly {10,410, 10,210, 210,210, 10,410}
color red
poly {10,410, 210,410, 210,210, 10,410}