Each tile realises only a subset of the parity-admissible alphabet on its rim,
and tiles genuinely omit interfaces (n=12 m=8: max 273/274, min 43). But any
two tiles always glue: interface subsets always overlap (n=9 m=3-6, n=12 m=3-8)
-- usually via a global universal seam present on every inner+outer rim, and
where none exists (n=12 m=7) the worst pair still shares 14 seams. The universal
seams are the low-complexity ones (<=2 colours, single contiguous block). No
local gluing obstruction; any obstruction must be global across a nested stack.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
didericis
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