Three negative seams
Abstract
Exact remaining physical charges
For the four-block masked word, charge has positive-chain bases zero, one, Z+1 and TZ+T+1. Summing the actual physical labels and the first three negative charges gives remaining charges A-1-v0, A-Z-1+v2 and A-(TZ+T+1)+v3+(Z+1)w. The equalities retain the selected masks rather than replacing the remaining charge by the conservative bound A.