Wed Sep 2 12:39:23 2020 chain_letter_dendrogram R version 3.4.4 (2018-03-15) Construct a dendrogram to analyze the relationship among a set of 11 versions of a chain letter. Chain letter distance matrix read from ' chain_letter_data.txt ' Graphics saved as " chain_letter_dendrogram.png " chain_letter_dendrogram: Normal end of execution.