There are 5 hosts numbered from 0 to 4, and 4 tasks numbered from 0 to 3. Each host has a set of tasks that it is interested in: 
Host 2 is interested in task 3.
Host 3 is interested in task 3.
Host 4 is interested in task 1.
Host 1 is interested in task 2.
Host 2 is interested in task 1.
Host 3 is interested in task 1.
Host 4 is interested in task 3.
Host 1 is interested in task 0.
Host 1 is interested in task 3.
Host 4 is interested in task 2.
Host 4 is interested in task 0.
Host 1 is interested in task 1..