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We consider text index construction in external memory (EM). Our first contribution is an inducing algorithm for suffix arrays in external memory. Practical tests show that this outperforms the previous best EM suffix sorter [Dementiev et al., ALENEX 2005] by a factor of about two in time and I/O-volume. Our second contribution is to augment the first algorithm to also construct the array of longest common prefixes (LCPs). This yields the first EM construction algorithm for LCP arrays. Thedoi:10.1137/1.9781611972931.8 dblp:conf/alenex/BingmannFO13 fatcat:6qkkdn5mdjf2dpni7szxrnkh3i