calculate total number of nodes
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Registered S3 method overwritten by 'treeio': method from root.phylo ape treeio v1.14.3 For help: https://yulab-smu.top/treedata-book/ If you use treeio in published research, please cite: LG Wang, TTY Lam, S Xu, Z Dai, L Zhou, T Feng, P Guo, CW Dunn, BR Jones, T Bradley, H Zhu, Y Guan, Y Jiang, G Yu. treeio: an R package for phylogenetic tree input and output with richly annotated and associated data. Molecular Biology and Evolution 2020, 37(2):599-603. doi: 10.1093/molbev/msz240  59  59
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