. Author manuscript; available in PMC: 2012 Feb 29.

Published in final edited form as: J Theor Biol. 2010 Jun 9;265(4):624–632. doi: 10.1016/j.jtbi.2010.06.010

Table 1.

The eight strategies considered in the present paper.

strategy	Cooperate?	Harm cooperators?	Harm defectors?
DN	no	no	no
DP	no	no	yes
DA	no	yes	no
DS	no	yes	yes
CN	yes	no	no
CP	yes	no	yes
CA	yes	yes	no
CS	yes	yes	yes

strategy	Cooperate?	Harm cooperators?	Harm defectors?
DN	no	no	no
DP	no	no	yes
DA	no	yes	no
DS	no	yes	yes
CN	yes	no	no
CP	yes	no	yes
CA	yes	yes	no
CS	yes	yes	yes

strategy	Cooperate?	Harm cooperators?	Harm defectors?
DN	no	no	no
DP	no	no	yes
DA	no	yes	no
DS	no	yes	yes
CN	yes	no	no
CP	yes	no	yes
CA	yes	yes	no
CS	yes	yes	yes

strategy	Cooperate?	Harm cooperators?	Harm defectors?
DN	no	no	no
DP	no	no	yes
DA	no	yes	no
DS	no	yes	yes
CN	yes	no	no
CP	yes	no	yes
CA	yes	yes	no
CS	yes	yes	yes