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(A) Complex Xi:Yj comprises hairpin Xi and strand Yj, with poly-T overhangs of length i and j respectively. Domains d and e are designed to be orthogonal to each other and the overhangs (sequences in Table 1). (B) Varying (i, j) from 
to 
with 
mimics the geometry branch migration intermediates [X20:Y00 (start), X10:Y10 (middle) and X00:Y20 (end), respectively]. No branch migration is intended in these complexes.
