R Sot 8 268745-753. 28. Pandianathan K. Boyd R (2003) A tale of two defectors: The Importance of standing for evolution of indirect reciprocity. f Theor Biol 229:11S-126. 29. Suzuki S. Akiyama E (2007) Evolution of indirect reciprocity in groups of various sizes and comparison with direct reciprocity. Th