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A closed conformation with the closing stack connected to a loop (A ) or to a stack (B ). (C ) The four open conformation types (L , M , R, and LR ). The closed conformation in A is formed from the open conformation in C through the closure of the unstacked loop of length l in A. ( D) The partition function for L-type conformations for a chain froma to b can be computed as the sum of the partition function for a shorter chain from a to b − 1.
