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and (3,4,5,6). The next bond, from atom 6, is also oriented by a dihedral angle, so we have four degrees of freedom. But that last bond has to end at the position of atom 1, which imposes three conditions in three-dimensional space. If the bond angle in the chain (6,1,2) should also be the tetrahedral angle then we have four conditions. Normally this would mean that there are no degrees of freedom of conformation, giving a finite number of solutions. With atoms 1, 2, and 3 fixed, there are two solutions,

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