The following are a subset of the run-maximal strings for rho_2(55) aabaababbababbabaababbababbaababbababbabaababbababbabaa aababaababbabaababaababbababbabaababaababbabaababaababb aababaababbababbabaababbababbaababbababbabaababbababbaa aababaababbababbabaababbababbaababbababbabaababbababbab