set object  1 rectangle from 0,10  to  9,19 fc lt 1
set object  2 rectangle from 10,10 to 19,19 fc lt 2
set object  3 rectangle from 20,10 to 29,19 fc lt 3
set object  4 rectangle from 30,10 to 39,19 fc lt 1
set object  5 rectangle from 40,10 to 49,19 fc lt 2
set object  6 rectangle from 50,10 to 59,19 fc lt 3
set object  7 rectangle from 60,10 to 69,19 fc lt 1
set object  8 rectangle from 70,10 to 79,19 fc lt 2
set object  9 rectangle from 80,10 to 89,19 fc lt 3
set object 10 rectangle from 90,10 to 99,19 fc lt 1

plot -100