Created task with PID 1.
Yielding to PID 1.
Created mailbox 1
Created task with PID 2.
Yielding to PID 2.
Created mailbox 2
Created mailbox 3
Yielding to PID 0.
Yielding to PID 1.
Created task with PID 3.
Yielding to PID 3.
Created mailbox 4
Message sent from box 4 to box 3
Yielding to PID 0.
Yielding to PID 1.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.
Message sent from box 1 to box 3
Yielding to PID 2.
Box 3 got a message from box 0.
Message sent from box 3 to box 1
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Yielding to PID 2.
Box 3 attempted to get a message, but there were none.
Yielding to PID 3.
Box 4 attempted to get a message, but there were none.
Yielding to PID 0.
Yielding to PID 1.
Box 1 got a message from box 0.