| http://www.w3.org/ns/prov#value | - wherein A and A' are A-type linear polymeric segments, B and B' are B-type linear polymeric segments, and R1, R2, R3 and R4 are either block copolymers of formulas (I), (II) or (III) or hydrogen and L is a linking group, with the proviso that no more than two of R1, R2, R3 or R4 are hydrogen.
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