2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/227793We show how, using different decompositions of E(11), one can calculate the representations under the duality group of the so--called "de-form" potentials. Evidence is presented that these potentials are in one-to-one correspondence to the embedding tensors that classify the gaugings of all maximal gauged supergravities. We supply the computer program underlying our calculations.16 pages, 13 tables; fixed typos, changed to JHEP styleHigh Energy Physics - Theorytext