Changes to be committed:
	new file:   simple1/.ipynb_checkpoints/sim1-checkpoint.ipynb
	modified:   simple1/sim1.ipynb
	modified:   simple2/.ipynb_checkpoints/person_network-checkpoint.ipynb
	new file:   simple2/circle_walk.odg
	new file:   simple2/circle_walk1.jpg
	modified:   simple2/person_network.ipynb
	modified:   simple2/simple2.ipynb