	group	id_in_group	role	payoff	reward_round	contribution	contribution_1	contribution_2	contribution_3	contribution_4	student_ID	payoff_0	payoff_1	payoff_2	payoff_3	payoff_4	final_payoff	group. id_in_subsession	group. total_contribution	group. total_contribution_1	group. total_contribution_2	group. total_contribution_3	group. total_contribution_4	group. individual_share	group. individual_share_1	group. individual_share_2	group. individual_share_3	group. individual_share_4	group. message	group. message_1	group. message_2	group. message_3	group. message_4