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didericis 09400cf9ae Add per-dual summary table for the six Holton-McKay duals at n=21
Table tab:n21 records, for each of the six duals: not an intertwining tree;
Even Level Graph source (duals 1,2 only); and bridge-switch path length to
an ELG (0,0 for the two ELG-outright cases; 3,1,2,4 for the rest). All six
are bridge-derived; all witnesses step-verified.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-22 11:13:04 -04:00
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