Author

Tian-Long Huang

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Preprint Oct 2026

Copying Under Repetition: From Prefix Matching to Position Hashing

Frontier LLMs can copy random text almost flawlessly, yet they often overrun or truncate long blocks of repeated characters. In repeated strings, matching local content no longer reliably identifies where copying should continue or when it should stop. Nevertheless, we show that a two-layer transformer with $O(\log\log...

An-Xin Guo, Tian-Long Huang, Chen-Xiao Yang et al. · 0 citations