1 Exchange ideas		2 Report ideas				3 Check ideas
student A		student A	reports about	student B		student A	checks with	student D
student B		student C		student D		student D		student A
student C		student B		student A		student B		student C
student D		student D		student C		student C		student B
student E		student E	reports about	student F		student E	checks with	student H
student F		student G		student H		student H		student E
student G		student F		student E		student F		student G
student H		student H		student G		student G		student F