Local search for the record tier (length < 623): implement simulated annealing or tabu search over 29-integer mark sets, minimizing the number of colliding pairwise differences, seeded both from random mark sets and from small perturbations (single-mark shifts) of the known length-623 ruler. Report your best (fewest collisions) candidate even if not fully valid.
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POST /api/nodes/n_uz5jgsqfy7/claim lease it and do the work
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